| Prefixes | City | County | Line Type | Company |
|---|---|---|---|---|
| 815-204 | Freeport | Stephenson | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-206 | Woodstock | McHenry | Landline | Ameritech Illinois |
| 815-207 | Joliet | Will | Landline | At&t Local |
| 815-208 | Fulton | Whiteside | Landline | Sprint Communications Compa... |
| 815-209 | Rockford | Winnebago | Landline | Level 3 Communications, Llc... |
| 815-210 | Plainfield | Will | Cell Phone | New Cingular Wireless Pcs,... |
| 815-212 | Crystal Lake | McHenry | Cell Phone | Tmobile Usa, Inc. |
| 815-213 | Sublette | Lee | Landline | United States Cellular Corp... |
| 815-214 | Bradley | Kankakee | Landline | Rcn Telecom Services Of Ill... |
| 815-215 | New Lenox | Will | Landline | Globalcom, Inc.il |
| 815-216 | Schaumburg | Cook | Cell Phone | Cellco Partnership Dba Veri... |
| 815-217 | Dekalb | Dekalb | Landline | Digital Network Access Comm... |
| 815-218 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-219 | Lake In The Hills | McHenry | Landline | United States Cellular Corp... |
| 815-220 | Peru | La Salle | Landline | Ameritech Illinois |
| 815-221 | Romeoville | Will | Landline | Teleport Communications Gro... |
| 815-222 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-223 | Peru | La Salle | Landline | Ameritech Illinois |
| 815-224 | Peru | La Salle | Landline | Ameritech Illinois |
| 815-225 | Milledgeville | Carroll | Landline | Citizens Telecom Co Illinoi... |
| 815-226 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-227 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-228 | Peru | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-229 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-230 | Plainfield | Will | Landline | Broadwing Communications, L... |
| 815-231 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-232 | Freeport | Stephenson | Landline | Frontier North, Inc. Il |
| 815-233 | Freeport | Stephenson | Landline | Frontier North, Inc. Il |
| 815-234 | Byron | Ogle | Landline | Frontier North, Inc. Il |
| 815-235 | Freeport | Stephenson | Landline | Frontier North, Inc. Il |
| 815-236 | McHenry | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-237 | Gardner | Grundy | Landline | Ameritech Illinois |
| 815-238 | Freeport | Stephenson | Cell Phone | Cellco Partnership Dba Veri... |
| 815-239 | Pecatonica | Winnebago | Landline | Frontier North, Inc. Il |
| 815-241 | Rockford | Winnebago | Landline | American Messaging (am), Inc. |
| 815-242 | New Lenox | Will | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-243 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-244 | Mount Carroll | Carroll | Landline | Gallatin River Communicatio... |
| 815-245 | McHenry | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-246 | Earlville | La Salle | Landline | Frontier North, Inc. Il |
| 815-247 | Pecatonica | Winnebago | Landline | Frontier North, Inc. Il |
| 815-248 | Davis | Stephenson | Landline | Frontier North, Inc. Il |
| 815-249 | Grand Ridge | La Salle | Landline | Frontier North, Inc. Il |
| 815-250 | La Salle | La Salle | Landline | Comcast Phone Of Illinois,... |
| 815-251 | Dixon | Lee | Landline | Gallatin River Communicatio... |
| 815-252 | Peru | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-253 | Kempton | Ford | Landline | Frontier Communications Of... |
| 815-254 | Plainfield | Will | Landline | Ameritech Illinois |
| 815-255 | Lisle | Dupage | Landline | Us Xchange Of Illinois Llc... |
| 815-256 | Cabery | Kankakee | Landline | Stelle Telephone Co. |
| 815-257 | Peru | La Salle | Landline | Illinois Valley Cellular Rs... |
| 815-258 | Grant Park | Kankakee | Cell Phone | New Cingular Wireless Pcs,... |
| 815-259 | Thomson | Carroll | Landline | Gallatin River Communicatio... |
| 815-260 | Crystal Lake | McHenry | Landline | United States Cellular Corp... |
| 815-261 | Crystal Lake | McHenry | Landline | Mci Worldcom Communications... |
| 815-262 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-263 | Joliet | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-264 | Waterman | Dekalb | Landline | Frontier North, Inc. Il |
| 815-265 | Gilman | Iroquois | Landline | Ameritech Illinois |
| 815-266 | Freeport | Stephenson | Landline | Frontier North, Inc. Il |
| 815-267 | Plainfield | Will | Landline | Mci Worldcom Communications... |
| 815-268 | Onarga | Iroquois | Landline | Ameritech Illinois |
| 815-269 | Danforth | Iroquois | Landline | Frontier Communications Of... |
| 815-270 | Roscoe | Winnebago | Landline | Charter Fiberlink Illinoi... |
| 815-271 | McHenry | McHenry | Landline | Mci Worldcom Communications... |
| 815-272 | Joliet | Will | Landline | Mci Worldcom Communications... |
| 815-273 | Savanna | Carroll | Landline | Gallatin River Communicatio... |
| 815-274 | Oswego | Kendall | Cell Phone | New Cingular Wireless Pcs,... |
| 815-275 | Freeport | Stephenson | Cell Phone | Cellco Partnership Dba Veri... |
| 815-276 | McHenry | McHenry | Landline | Teleport Communications Gro... |
| 815-277 | Frankfort | Will | Landline | Teleport Communications Gro... |
| 815-280 | Joliet | Will | Landline | Teleport Communications Gro... |
| 815-281 | Savanna | Carroll | Landline | United States Cellular Corp... |
| 815-282 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-283 | Hoopeston | Vermilion | Landline | Mediacom Telephony Of Illin... |
| 815-284 | Dixon | Lee | Landline | Gallatin River Communicatio... |
| 815-285 | Dixon | Lee | Landline | Gallatin River Communicatio... |
| 815-286 | Hinckley | Dekalb | Landline | Frontier North, Inc. Il |
| 815-287 | Verona | Grundy | Landline | Ameritech Illinois |
| 815-288 | Dixon | Lee | Landline | Gallatin River Communicatio... |
| 815-289 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-290 | Ottawa | La Salle | Landline | Sbc Internet Services, Inc. |
| 815-291 | Freeport | Stephenson | Landline | United States Cellular Corp... |
| 815-292 | Poplar Grove | Boone | Landline | Bergen Telephone Co. Illi... |
| 815-293 | Romeoville | Will | Landline | Ameritech Illinois |
| 815-294 | Kankakee | Kankakee | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-295 | Chicago | Cook | Cell Phone | Tmobile Usa, Inc. |
| 815-296 | Romeoville | Will | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-297 | Freeport | Stephenson | Landline | Frontier North, Inc. Il |
| 815-298 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-299 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-301 | Homer Glen | Will | Landline | Broadwing Communications, L... |
| 815-302 | Joliet | Will | Cell Phone | Sprint Spectrum L.p. |
| 815-303 | Princeton | Bureau | Landline | Illinois Valley Cellular Rs... |
| 815-304 | Kankakee | Kankakee | Landline | Broadwing Communications, L... |
| 815-305 | Braceville | Grundy | Landline | Broadwing Communications, L... |
| 815-306 | Lockport | Will | Landline | Broadwing Communications, L... |
| 815-307 | McHenry | McHenry | Landline | Broadwing Communications, L... |
| 815-308 | Woodstock | McHenry | Landline | Broadwing Communications, L... |
| 815-310 | Crystal Lake | McHenry | Landline | Broadwing Communications, L... |
| 815-313 | Ottawa | La Salle | Landline | Broadwing Communications, L... |
| 815-314 | Rockton | Winnebago | Landline | Broadwing Communications, L... |
| 815-315 | Rockford | Winnebago | Landline | Level 3 Communications, Llc... |
| 815-316 | Rockford | Winnebago | Landline | Tds Metrocom Inc.il |
| 815-317 | Crescent City | Iroquois | Landline | Broadwing Communications, L... |
| 815-318 | Morrison | Whiteside | Landline | Broadwing Communications, L... |
| 815-319 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-321 | Woodstock | McHenry | Landline | Xo Illinois, Inc. |
| 815-322 | McHenry | McHenry | Landline | Level 3 Communications, Llc... |
| 815-323 | Belvidere | Boone | Landline | Level 3 Communications, Llc... |
| 815-324 | McHenry | McHenry | Landline | Mediacom Telephony Of Illin... |
| 815-325 | Crest Hill | Will | Cell Phone | New Cingular Wireless Pcs,... |
| 815-326 | Oglesby | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-327 | Plainfield | Will | Landline | Broadwing Communications, L... |
| 815-328 | Romeoville | Will | Landline | Broadwing Communications, L... |
| 815-330 | Rockford | Winnebago | Landline | Globalcom, Inc.il |
| 815-331 | McHenry | McHenry | Landline | Broadwing Communications, L... |
| 815-332 | Cherry Valley | Winnebago | Landline | Frontier North, Inc. Il |
| 815-333 | Harvey | Cook | Landline | Broadwing Communications, L... |
| 815-334 | Woodstock | McHenry | Landline | Ameritech Illinois |
| 815-335 | Winnebago | Winnebago | Landline | Frontier North, Inc. Il |
| 815-336 | Sterling | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-337 | Woodstock | McHenry | Landline | Ameritech Illinois |
| 815-338 | Woodstock | McHenry | Landline | Ameritech Illinois |
| 815-339 | Granville | Putnam | Landline | Frontier North, Inc. Il |
| 815-340 | La Moille | Lee | Landline | Comcast Phone Of Illinois,... |
| 815-341 | Crystal Lake | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-342 | Crystal Lake | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-343 | Peru | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-344 | McHenry | McHenry | Landline | Ameritech Illinois |
| 815-345 | Woodstock | McHenry | Landline | Level 3 Communications, Llc... |
| 815-346 | New York | New York | Landline | Broadwing Communications, L... |
| 815-347 | McHenry | McHenry | Cell Phone | Cellco Partnership Dba Veri... |
| 815-348 | Woodstock | McHenry | Landline | Us Xchange Of Illinois Llc... |
| 815-349 | Frankfort | Will | Landline | Xo Illinois, Inc. |
| 815-350 | Franklin Grove | Lee | Landline | Essex Telcom, Inc. |
| 815-351 | Joliet | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-352 | Bourbonnais | Kankakee | Landline | Broadwing Communications, L... |
| 815-353 | McHenry | McHenry | Cell Phone | Cellco Partnership Dba Veri... |
| 815-354 | Shorewood | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-355 | Crystal Lake | McHenry | Cell Phone | Cellco Partnership Dba Veri... |
| 815-356 | Crystal Lake | McHenry | Landline | Ameritech Illinois |
| 815-357 | Seneca | La Salle | Landline | Ameritech Illinois |
| 815-358 | Cornell | Livingston | Landline | Cr Telephone Co. |
| 815-359 | Harmon | Lee | Landline | Gallatin River Communicatio... |
| 815-360 | Rockford | Winnebago | Landline | Essex Telcom, Inc. |
| 815-361 | Manhattan | Will | Landline | Broadwing Communications, L... |
| 815-362 | German Valley | Stephenson | Landline | Frontier North, Inc. Il |
| 815-363 | McHenry | McHenry | Landline | Ameritech Illinois |
| 815-364 | Chicago | Cook | Landline | Broadwing Communications, L... |
| 815-365 | Essex | Kankakee | Landline | Frontier North, Inc. Il |
| 815-366 | Ottawa | La Salle | Landline | Broadwing Communications, L... |
| 815-367 | Winslow | Stephenson | Landline | Frontier North, Inc. Il |
| 815-368 | Lostant | La Salle | Landline | Frontier North, Inc. Il |
| 815-369 | Lena | Stephenson | Landline | Frontier North, Inc. Il |
| 815-370 | Kankakee | Kankakee | Cell Phone | Cellco Partnership Dba Veri... |
| 815-371 | Utica | La Salle | Landline | Broadwing Communications, L... |
| 815-372 | Romeoville | Will | Landline | Ameritech Illinois |
| 815-373 | Onarga | Iroquois | Landline | Us Xchange Of Illinois Llc... |
| 815-375 | Dekalb | Dekalb | Landline | United States Cellular Corp... |
| 815-376 | Ohio | Bureau | Landline | Frontier North, Inc. Il |
| 815-377 | Sycamore | Dekalb | Landline | Broadwing Communications, L... |
| 815-378 | Rockford | Winnebago | Cell Phone | Nextel Communications, Inc. |
| 815-379 | Walnut | Bureau | Landline | Frontier North, Inc. Il |
| 815-380 | Sterling | Whiteside | Landline | Essex Telcom, Inc. |
| 815-381 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-382 | McHenry | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-383 | Watseka | Iroquois | Cell Phone | New Cingular Wireless Pcs,... |
| 815-384 | Rochelle | Ogle | Landline | Frontier North, Inc. Il |
| 815-385 | McHenry | McHenry | Landline | Ameritech Illinois |
| 815-387 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-388 | Woodstock | McHenry | Cell Phone | Nextel Communications, Inc. |
| 815-389 | South Beloit | Winnebago | Landline | Ameritech Illinois |
| 815-390 | Braidwood | Will | Landline | Comcast Phone Of Illinois,... |
| 815-391 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-392 | Kinsman | Grundy | Landline | Kinsman Mutual Telephone Co... |
| 815-393 | Monroe Center | Ogle | Landline | Frontier North, Inc. Il |
| 815-394 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-395 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-396 | Steward | Lee | Landline | Frontier North, Inc. Il |
| 815-397 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-398 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-399 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-401 | Kankakee | Kankakee | Landline | Level 3 Communications, Llc... |
| 815-402 | Galena | Jo Daviess | Landline | Sprint Communications Compa... |
| 815-403 | McHenry | McHenry | Cell Phone | Sprint Spectrum L.p. |
| 815-404 | Crystal Lake | McHenry | Cell Phone | Sprint Spectrum L.p. |
| 815-405 | Plainfield | Will | Cell Phone | Nextel Communications, Inc. |
| 815-406 | Byron | Ogle | Landline | Frontier North, Inc. Il |
| 815-407 | Romeoville | Will | Landline | Ameritech Illinois |
| 815-408 | Utica | La Salle | Landline | Globalcom, Inc.il |
| 815-409 | Joliet | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-410 | Granville | Putnam | Landline | Level 3 Communications, Llc... |
| 815-412 | Frankfort | Will | Landline | Broadwing Communications, L... |
| 815-414 | Crystal Lake | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-415 | Marseilles | La Salle | Landline | Ameritech Illinois |
| 815-416 | Morris | Grundy | Landline | Ameritech Illinois |
| 815-417 | Braceville | Grundy | Landline | Ameritech Illinois |
| 815-418 | Manhattan | Will | Landline | Globalcom, Inc.il |
| 815-419 | Pontiac | Livingston | Landline | At&t Local |
| 815-420 | Joliet | Will | Landline | Essex Telcom, Inc. |
| 815-421 | Herscher | Kankakee | Landline | Ameritech Illinois |
| 815-422 | Saint Anne | Kankakee | Landline | Ameritech Illinois |
| 815-423 | Elwood | Will | Landline | Ameritech Illinois |
| 815-424 | Elwood | Will | Landline | Ameritech Illinois |
| 815-425 | Rockford | Winnebago | Landline | Broadwing Communications, L... |
| 815-426 | Herscher | Kankakee | Landline | Ameritech Illinois |
| 815-427 | Saint Anne | Kankakee | Landline | Ameritech Illinois |
| 815-428 | Martinton | Iroquois | Landline | Frontier North, Inc. Il |
| 815-429 | Sheldon | Iroquois | Landline | Frontier North, Inc. Il |
| 815-430 | McHenry | McHenry | Landline | Globalcom, Inc.il |
| 815-431 | Ottawa | La Salle | Landline | Ameritech Illinois |
| 815-432 | Watseka | Iroquois | Landline | Ameritech Illinois |
| 815-433 | Ottawa | La Salle | Landline | Ameritech Illinois |
| 815-434 | Ottawa | La Salle | Landline | Ameritech Illinois |
| 815-435 | Beaverville | Iroquois | Landline | Frontier North, Inc. Il |
| 815-436 | Plainfield | Will | Landline | Ameritech Illinois |
| 815-437 | Putnam | Putnam | Landline | Frontier North, Inc. Il |
| 815-438 | Tampico | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-439 | Plainfield | Will | Landline | Ameritech Illinois |
| 815-440 | Dixon | Lee | Cell Phone | Cellco Partnership Dba Veri... |
| 815-441 | Rock Falls | Whiteside | Cell Phone | Cellco Partnership Dba Veri... |
| 815-442 | Tonica | La Salle | Landline | Tonica Telephone Co. |
| 815-443 | Pearl City | Stephenson | Landline | Frontier North, Inc. Il |
| 815-444 | Crystal Lake | McHenry | Landline | Ameritech Illinois |
| 815-445 | Manlius | Bureau | Landline | Frontier North, Inc. Il |
| 815-446 | Cedar Point | La Salle | Landline | Frontier North, Inc. Il |
| 815-447 | Depue | Bureau | Landline | Frontier Communications Of... |
| 815-448 | Mazon | Grundy | Landline | Ameritech Illinois |
| 815-449 | Dakota | Stephenson | Landline | Frontier North, Inc. Il |
| 815-450 | Momence | Kankakee | Cell Phone | New Cingular Wireless Pcs,... |
| 815-451 | Marengo | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-452 | Toluca | Marshall | Landline | Frontier North, Inc. Il |
| 815-453 | Ashton | Lee | Landline | Frontier North, Inc. Il |
| 815-454 | Sheffield | Bureau | Landline | Frontier North, Inc. Il |
| 815-455 | Crystal Lake | McHenry | Landline | Ameritech Illinois |
| 815-456 | Franklin Grove | Lee | Landline | Frontier North, Inc. Il |
| 815-457 | Cissna Park | Iroquois | Landline | Frontier Communications Of... |
| 815-458 | Braidwood | Will | Landline | Ameritech Illinois |
| 815-459 | Crystal Lake | McHenry | Landline | Ameritech Illinois |
| 815-460 | Joliet | Will | Landline | Globalcom, Inc.il |
| 815-461 | New Lenox | Will | Landline | Broadwing Communications, L... |
| 815-462 | New Lenox | Will | Landline | Ameritech Illinois |
| 815-463 | New Lenox | Will | Landline | Ameritech Illinois |
| 815-464 | Frankfort | Will | Landline | Ameritech Illinois |
| 815-465 | Grant Park | Kankakee | Landline | Ameritech Illinois |
| 815-466 | Grant Park | Kankakee | Landline | Ameritech Illinois |
| 815-467 | Channahon | Will | Landline | Ameritech Illinois |
| 815-468 | Manteno | Kankakee | Landline | Ameritech Illinois |
| 815-469 | Frankfort | Will | Landline | Ameritech Illinois |
| 815-471 | Watseka | Iroquois | Landline | Illinois Valley Cellular Rs... |
| 815-472 | Momence | Kankakee | Landline | Ameritech Illinois |
| 815-473 | Woodland | Iroquois | Landline | Frontier Communications Of... |
| 815-474 | Kankakee | Kankakee | Cell Phone | New Cingular Wireless Pcs,... |
| 815-475 | Minooka | Grundy | Landline | Ameritech Illinois |
| 815-476 | Wilmington | Will | Landline | Ameritech Illinois |
| 815-477 | Crystal Lake | McHenry | Landline | Ameritech Illinois |
| 815-478 | Manhattan | Will | Landline | Ameritech Illinois |
| 815-479 | Crystal Lake | McHenry | Landline | Ameritech Illinois |
| 815-481 | Ottawa | La Salle | Landline | Illinois Valley Cellular Rs... |
| 815-482 | McHenry | McHenry | Cell Phone | Nextel Communications, Inc. |
| 815-483 | Joliet | Will | Cell Phone | Sprint Spectrum L.p. |
| 815-484 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-485 | New Lenox | Will | Landline | Ameritech Illinois |
| 815-486 | Donovan | Iroquois | Landline | Frontier North, Inc. Il |
| 815-487 | Plainfield | Will | Landline | Globalcom, Inc.il |
| 815-488 | Peru | La Salle | Landline | Illinois Valley Cellular Rs... |
| 815-489 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-490 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-492 | Apple River | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-493 | Lanark | Carroll | Landline | Citizens Telecom Co Illinoi... |
| 815-494 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-495 | Leland | La Salle | Landline | Frontier North, Inc. Il |
| 815-496 | Sheridan | La Salle | Landline | Frontier North, Inc. Il |
| 815-497 | Compton | Lee | Landline | Frontier North, Inc. Il |
| 815-498 | Somonauk | Dekalb | Landline | Frontier North, Inc. Il |
| 815-499 | Dixon | Lee | Landline | United States Cellular Corp... |
| 815-500 | Marseilles | La Salle | Landline | Sprint Communications Compa... |
| 815-501 | Dekalb | Dekalb | Cell Phone | Sprint Spectrum L.p. |
| 815-502 | Woodstock | McHenry | Landline | Globalcom, Inc.il |
| 815-505 | Rockford | Winnebago | Cell Phone | Tmobile Usa, Inc. |
| 815-506 | Chicago | Cook | Landline | Level 3 Communications, Llc... |
| 815-508 | Maple Park | Kane | Cell Phone | New Cingular Wireless Pcs,... |
| 815-509 | Rockford | Winnebago | Cell Phone | Nextel Communications, Inc. |
| 815-512 | Lockport | Will | Landline | Globalcom, Inc.il |
| 815-513 | Morris | Grundy | Landline | Level 3 Communications, Llc... |
| 815-514 | Lockport | Will | Cell Phone | Nextel Communications, Inc. |
| 815-515 | Watseka | Iroquois | Landline | Level 3 Communications, Llc... |
| 815-516 | Cary | McHenry | Cell Phone | Nextel Communications, Inc. |
| 815-517 | Dekalb | Dekalb | Landline | Mci Worldcom Communications... |
| 815-518 | Coal City | Grundy | Landline | Globalcom, Inc.il |
| 815-519 | Rockford | Winnebago | Cell Phone | Sprint Spectrum L.p. |
| 815-520 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-521 | Minooka | Grundy | Landline | Ameritech Illinois |
| 815-522 | Kirkland | Dekalb | Landline | Frontier North, Inc. Il |
| 815-523 | New Lenox | Will | Landline | Teleport Communications Gro... |
| 815-524 | Lockport | Will | Landline | Teleport Communications Gro... |
| 815-525 | South Beloit | Winnebago | Landline | Tds Metrocom Inc.il |
| 815-526 | McHenry | McHenry | Landline | Teleport Communications Gro... |
| 815-527 | Woodstock | McHenry | Landline | Teleport Communications Gro... |
| 815-528 | Chicago | Cook | Landline | Teleport Communications Gro... |
| 815-529 | Shorewood | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-530 | Momence | Kankakee | Cell Phone | Nextel Communications, Inc. |
| 815-531 | Joliet | Will | Landline | Teleport Communications Gro... |
| 815-532 | Frankfort | Will | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-534 | Frankfort | Will | Landline | Level 3 Communications, Llc... |
| 815-535 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-536 | Ransom | La Salle | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-537 | Prophetstown | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-538 | Mendota | La Salle | Landline | Frontier North, Inc. Il |
| 815-539 | Mendota | La Salle | Landline | Frontier North, Inc. Il |
| 815-540 | Rockford | Winnebago | Cell Phone | Sprint Spectrum L.p. |
| 815-541 | Freeport | Stephenson | Landline | United States Cellular Corp... |
| 815-542 | Tampico | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-543 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-544 | Belvidere | Boone | Landline | Frontier North, Inc. Il |
| 815-545 | Joliet | Will | Cell Phone | New Cingular Wireless Pcs,... |
| 815-546 | McHenry | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-547 | Belvidere | Boone | Landline | Frontier North, Inc. Il |
| 815-548 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-549 | Kankakee | Kankakee | Cell Phone | Sprint Spectrum L.p. |
| 815-550 | Woodstock | McHenry | Landline | Broadwing Communications, L... |
| 815-551 | McHenry | McHenry | Landline | Essex Telcom, Inc. |
| 815-552 | Leland | La Salle | Landline | Ameritech Illinois |
| 815-553 | Joliet | Will | Landline | Ovation Communications Of I... |
| 815-554 | East Dubuque | Jo Daviess | Landline | Sprint Communications Compa... |
| 815-556 | Plainfield | Will | Landline | Broadwing Communications, L... |
| 815-557 | Plainfield | Will | Cell Phone | Sprint Spectrum L.p. |
| 815-558 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-559 | Kankakee | Kankakee | Landline | Essex Telcom, Inc. |
| 815-560 | McHenry | McHenry | Cell Phone | Nextel Communications, Inc. |
| 815-561 | Rochelle | Ogle | Landline | Frontier North, Inc. Il |
| 815-562 | Rochelle | Ogle | Landline | Frontier North, Inc. Il |
| 815-563 | Freeport | Stephenson | Landline | Frontier North, Inc. Il |
| 815-564 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-565 | Savanna | Carroll | Landline | Sprint Communications Compa... |
| 815-566 | Belvidere | Boone | Landline | Level 3 Communications, Llc... |
| 815-567 | Campus | Livingston | Landline | Frontier North, Inc. Il |
| 815-568 | Marengo | McHenry | Landline | Ameritech Illinois |
| 815-569 | Capron | Boone | Landline | Frontier North, Inc. Il |
| 815-570 | Sandwich | Dekalb | Landline | Level 3 Communications, Llc... |
| 815-571 | Shannon | Carroll | Landline | Sprint Communications Compa... |
| 815-572 | Marengo | McHenry | Landline | Broadwing Communications, L... |
| 815-573 | Bourbonnais | Kankakee | Landline | Level 3 Communications, Llc... |
| 815-574 | Joliet | Will | Landline | Essex Telcom, Inc. |
| 815-575 | McHenry | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-576 | Shorewood | Will | Landline | Essex Telcom, Inc. |
| 815-577 | Plainfield | Will | Landline | Ameritech Illinois |
| 815-578 | McHenry | McHenry | Landline | Ameritech Illinois |
| 815-579 | Ottawa | La Salle | Cell Phone | Sprint Spectrum L.p. |
| 815-580 | Cherry Valley | Winnebago | Landline | At&t Local |
| 815-581 | Spring Grove | McHenry | Landline | Comcast Phone Of Illinois,... |
| 815-582 | Joliet | Will | Cell Phone | Tmobile Usa, Inc. |
| 815-583 | Stockton | Jo Daviess | Landline | Essex Telcom, Inc. |
| 815-584 | Dwight | Livingston | Landline | Ameritech Illinois |
| 815-585 | Morris | Grundy | Landline | Level 3 Communications, Llc... |
| 815-586 | Ransom | La Salle | Landline | Cr Telephone Co. |
| 815-587 | Ottawa | La Salle | Landline | Level 3 Communications, Llc... |
| 815-588 | Lockport | Will | Landline | Ameritech Illinois |
| 815-589 | Fulton | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-590 | Aledo | Mercer | Cell Phone | Sprint Spectrum L.p. |
| 815-591 | Hanover | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-592 | Kankakee | Kankakee | Cell Phone | Cellco Partnership Dba Veri... |
| 815-593 | South Beloit | Winnebago | Landline | At&t Local |
| 815-594 | Apple River | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-595 | Oregon | Ogle | Landline | At&t Local |
| 815-596 | Marengo | McHenry | Landline | Sbc Internet Services, Inc. |
| 815-597 | Garden Prairie | Boone | Landline | Frontier North, Inc. Il |
| 815-598 | Elizabeth | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-599 | Freeport | Stephenson | Landline | Frontier North, Inc. Il |
| 815-600 | Bourbonnais | Kankakee | Cell Phone | New Cingular Wireless Pcs,... |
| 815-601 | Rockford | Winnebago | Landline | Bitwise Communications, Inc... |
| 815-602 | Kankakee | Kankakee | Landline | Globalcom, Inc.il |
| 815-603 | Plainfield | Will | Cell Phone | Tmobile Usa, Inc. |
| 815-605 | Woodstock | McHenry | Landline | Level 3 Communications, Llc... |
| 815-606 | Belvidere | Boone | Landline | Globalcom, Inc.il |
| 815-608 | Momence | Kankakee | Cell Phone | Tmobile Usa, Inc. |
| 815-609 | Plainfield | Will | Landline | Ameritech Illinois |
| 815-610 | Bloomington | McLean | Landline | Bitwise Communications, Inc... |
| 815-612 | McHenry | McHenry | Landline | Bitwise Communications, Inc... |
| 815-614 | Kankakee | Kankakee | Landline | Broadwing Communications, L... |
| 815-615 | Loves Park | Winnebago | Landline | Level 3 Communications, Llc... |
| 815-616 | Freeport | Stephenson | Cell Phone | Tmobile Usa, Inc. |
| 815-619 | Morris | Grundy | Landline | Aero North Communications,... |
| 815-621 | Rockford | Winnebago | Cell Phone | Sprint Spectrum L.p. |
| 815-622 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-623 | Roscoe | Winnebago | Landline | Frontier North, Inc. Il |
| 815-624 | Rockton | Winnebago | Landline | Frontier North, Inc. Il |
| 815-625 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-626 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-627 | Paw Paw | Lee | Landline | Frontier North, Inc. Il |
| 815-628 | West Brooklyn | Lee | Landline | Frontier North, Inc. Il |
| 815-629 | Rockton | Winnebago | Landline | Frontier North, Inc. Il |
| 815-630 | Joliet | Will | Cell Phone | Tmobile Usa, Inc. |
| 815-631 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-632 | Sterling | Whiteside | Landline | Ameritech Illinois |
| 815-633 | Machesney Park | Winnebago | Landline | Ameritech Illinois |
| 815-634 | Coal City | Grundy | Landline | Ameritech Illinois |
| 815-635 | Chatsworth | Livingston | Landline | Frontier North, Inc. Il |
| 815-636 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-637 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-638 | La Moille | Lee | Landline | Frontier North, Inc. Il |
| 815-639 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-641 | Crest Hill | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-642 | Minooka | Grundy | Landline | Broadwing Communications, L... |
| 815-643 | Princeton | Bureau | Landline | Frontier North, Inc. Il |
| 815-644 | Clifton | Iroquois | Landline | Rcn Telecom Services Of Ill... |
| 815-645 | Stillman Valley | Ogle | Landline | Frontier North, Inc. Il |
| 815-646 | Tiskilwa | Bureau | Landline | Frontier North, Inc. Il |
| 815-647 | Cullom | Livingston | Landline | Sprint Communications Compa... |
| 815-648 | Hebron | McHenry | Landline | Frontier North, Inc. Il |
| 815-649 | Crystal Lake | McHenry | Landline | Rcn Telecom Services Of Ill... |
| 815-650 | Rockford | Winnebago | Landline | At&t Local |
| 815-651 | Joliet | Will | Landline | Rcn Telecom Services Of Ill... |
| 815-652 | Dixon | Lee | Landline | Gallatin River Communicatio... |
| 815-653 | Wonder Lake | McHenry | Landline | Frontier North, Inc. Il |
| 815-654 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-655 | Plainfield | Will | Landline | Essex Telcom, Inc. |
| 815-656 | Sycamore | Dekalb | Landline | Level 3 Communications, Llc... |
| 815-657 | Forrest | Livingston | Landline | Ameritech Illinois |
| 815-658 | Crystal Lake | McHenry | Landline | Essex Telcom, Inc. |
| 815-659 | Princeton | Bureau | Landline | Frontier North, Inc. Il |
| 815-661 | Bradley | Kankakee | Landline | Rcn Telecom Services Of Ill... |
| 815-662 | Fairbury | Livingston | Landline | Level 3 Communications, Llc... |
| 815-663 | Spring Valley | Bureau | Landline | Frontier North, Inc. Il |
| 815-664 | Spring Valley | Bureau | Landline | Frontier North, Inc. Il |
| 815-665 | Manhattan | Will | Landline | Rcn Telecom Services Of Ill... |
| 815-666 | Joliet | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-667 | Utica | La Salle | Landline | Ameritech Illinois |
| 815-668 | McHenry | McHenry | Landline | Neutral Tandemillinois, Ll... |
| 815-669 | McHenry | McHenry | Landline | Level 3 Communications, Llc... |
| 815-670 | Rockford | Winnebago | Cell Phone | Sprint Spectrum L.p. |
| 815-671 | Joliet | Will | Landline | Level 3 Communications, Llc... |
| 815-672 | Streator | La Salle | Landline | Frontier North, Inc. Il |
| 815-673 | Streator | La Salle | Landline | Frontier North, Inc. Il |
| 815-674 | Streator | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-675 | Spring Grove | McHenry | Landline | Frontier North, Inc. Il |
| 815-676 | Plainfield | Will | Landline | Level 3 Communications, Llc... |
| 815-678 | Richmond | McHenry | Landline | Frontier North, Inc. Il |
| 815-679 | McHenry | McHenry | Landline | Rcn Telecom Services Of Ill... |
| 815-680 | Manhattan | Will | Landline | Rcn Telecom Services Of Ill... |
| 815-681 | Joliet | Will | Cell Phone | Cellco Partnership Dba Veri... |
| 815-682 | Milford | Iroquois | Landline | Frontier Communications Of... |
| 815-683 | Crescent City | Iroquois | Landline | Ameritech Illinois |
| 815-684 | Chadwick | Carroll | Landline | Citizens Telecom Co Illinoi... |
| 815-685 | Joliet | Will | Cell Phone | New Cingular Wireless Pcs,... |
| 815-686 | Piper City | Ford | Landline | Frontier North, Inc. Il |
| 815-687 | Shorewood | Will | Landline | Rcn Telecom Services Of Ill... |
| 815-688 | Strawn | Livingston | Landline | Frontier North, Inc. Il |
| 815-689 | Cullom | Livingston | Landline | Frontier Communications Of... |
| 815-690 | Plainfield | Will | Landline | United States Cellular Corp... |
| 815-691 | Utica | La Salle | Landline | Rcn Telecom Services Of Ill... |
| 815-692 | Fairbury | Livingston | Landline | Frontier North, Inc. Il |
| 815-693 | Joliet | Will | Cell Phone | Nextel Communications, Inc. |
| 815-694 | Clifton | Iroquois | Landline | Frontier North, Inc. Il |
| 815-695 | Newark | Kendall | Landline | Ameritech Illinois |
| 815-696 | Piper City | Ford | Landline | Aero North Communications,... |
| 815-697 | Chebanse | Kankakee | Landline | Frontier North, Inc. Il |
| 815-698 | Ashkum | Iroquois | Landline | Frontier North, Inc. Il |
| 815-699 | Wyanet | Bureau | Landline | Frontier North, Inc. Il |
| 815-702 | Saunemin | Livingston | Landline | Sprint Communications Compa... |
| 815-703 | Rockford | Winnebago | Cell Phone | Nextel Communications, Inc. |
| 815-704 | South Beloit | Winnebago | Landline | Mcleodusa Telecommunication... |
| 815-705 | Rockford | Winnebago | Landline | Teleport Communications Gro... |
| 815-707 | Loves Park | Winnebago | Landline | Level 3 Communications, Llc... |
| 815-708 | Rockford | Winnebago | Landline | Comcast Phone Of Illinois,... |
| 815-710 | Morris | Grundy | Landline | At&t Local |
| 815-712 | Ottawa | La Salle | Cell Phone | Nextel Communications, Inc. |
| 815-713 | Rockford | Winnebago | Cell Phone | New Cingular Wireless Pcs,... |
| 815-714 | Joliet | Will | Landline | Sprint Communications Compa... |
| 815-715 | Marengo | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-716 | Sterling | Whiteside | Cell Phone | Nextel Communications, Inc. |
| 815-717 | New Lenox | Will | Landline | Broadwing Communications, L... |
| 815-718 | Sublette | Lee | Landline | United States Cellular Corp... |
| 815-719 | Peru | La Salle | Cell Phone | Nextel Communications, Inc. |
| 815-720 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-721 | Rockford | Winnebago | Landline | At&t Local |
| 815-722 | Joliet | Will | Landline | Ameritech Illinois |
| 815-723 | Joliet | Will | Landline | Ameritech Illinois |
| 815-724 | Joliet | Will | Landline | Ameritech Illinois |
| 815-725 | Joliet | Will | Landline | Ameritech Illinois |
| 815-726 | Joliet | Will | Landline | Ameritech Illinois |
| 815-727 | Joliet | Will | Landline | Ameritech Illinois |
| 815-728 | Wonder Lake | McHenry | Landline | Frontier North, Inc. Il |
| 815-729 | Joliet | Will | Landline | Ameritech Illinois |
| 815-730 | Joliet | Will | Landline | Ameritech Illinois |
| 815-731 | Plainfield | Will | Landline | Ameritech Illinois |
| 815-732 | Oregon | Ogle | Landline | Frontier North, Inc. Il |
| 815-733 | Plainfield | Will | Landline | Rcn Telecom Services Of Ill... |
| 815-734 | Mount Morris | Ogle | Landline | Frontier North, Inc. Il |
| 815-735 | Joliet | Will | Cell Phone | New Cingular Wireless Pcs,... |
| 815-736 | Newark | Kendall | Landline | Ameritech Illinois |
| 815-737 | Capron | Boone | Landline | Sharon Telephone Co. Illi... |
| 815-738 | Leaf River | Ogle | Landline | Leaf River Telephone Co. |
| 815-739 | Dekalb | Dekalb | Cell Phone | Nextel Communications, Inc. |
| 815-740 | Joliet | Will | Landline | Ameritech Illinois |
| 815-741 | Joliet | Will | Landline | Ameritech Illinois |
| 815-742 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-743 | Graymont | Livingston | Landline | Frontier Communications Of... |
| 815-744 | Joliet | Will | Landline | Ameritech Illinois |
| 815-745 | Warren | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-746 | Elizabeth | Jo Daviess | Landline | Marseilles Telephone Co. Of... |
| 815-747 | East Dubuque | Jo Daviess | Landline | Citizens Telecom Co Illinoi... |
| 815-748 | Dekalb | Dekalb | Landline | Frontier North, Inc. Il |
| 815-749 | Rockford | Winnebago | Landline | Answer America Dba Answer Usa |
| 815-751 | Dekalb | Dekalb | Cell Phone | Cellco Partnership Dba Veri... |
| 815-752 | Morris | Grundy | Landline | Frontier North, Inc. Il |
| 815-753 | Dekalb | Dekalb | Landline | Frontier North, Inc. Il |
| 815-754 | Dekalb | Dekalb | Landline | Frontier North, Inc. Il |
| 815-755 | Joliet | Will | Landline | American Messaging (am), Inc. |
| 815-756 | Dekalb | Dekalb | Landline | Frontier North, Inc. Il |
| 815-757 | Sycamore | Dekalb | Landline | United States Cellular Corp... |
| 815-758 | Dekalb | Dekalb | Landline | Frontier North, Inc. Il |
| 815-759 | McHenry | McHenry | Landline | Ameritech Illinois |
| 815-760 | Bureau | Bureau | Cell Phone | Cellco Partnership Dba Veri... |
| 815-761 | Dekalb | Dekalb | Cell Phone | Cellco Partnership Dba Veri... |
| 815-762 | Dekalb | Dekalb | Cell Phone | Cellco Partnership Dba Veri... |
| 815-763 | Princeton | Mille Lacs | Landline | Answer America Dba Answer Usa |
| 815-764 | North Hollywood | Los Angeles | Landline | United States Cellular Corp... |
| 815-765 | Poplar Grove | Boone | Landline | Frontier North, Inc. Il |
| 815-766 | Sublette | Lee | Landline | United States Cellular Corp... |
| 815-767 | Joliet | Will | Landline | American Messaging (am), Inc. |
| 815-768 | Joliet | Will | Landline | Ameritech Illinois |
| 815-769 | Marseilles | La Salle | Landline | Broadwing Communications, L... |
| 815-770 | Harvard | McHenry | Landline | Charter Fiberlink Illinoi... |
| 815-771 | Romeoville | Will | Landline | Rcn Telecom Services Of Ill... |
| 815-772 | Morrison | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-773 | Joliet | Will | Landline | Ameritech Illinois |
| 815-774 | Joliet | Will | Landline | Ameritech Illinois |
| 815-775 | Morrison | Whiteside | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-776 | Galena | Jo Daviess | Landline | Ameritech Illinois |
| 815-777 | Galena | Jo Daviess | Landline | Ameritech Illinois |
| 815-778 | Lyndon | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-780 | La Salle | La Salle | Landline | Broadwing Communications, L... |
| 815-782 | Plainfield | Will | Landline | Broadwing Communications, L... |
| 815-783 | Romeoville | Will | Landline | Rcn Telecom Services Of Ill... |
| 815-784 | Genoa | Dekalb | Landline | Frontier North, Inc. Il |
| 815-785 | Sheldon | Iroquois | Landline | Rcn Telecom Services Of Ill... |
| 815-786 | Sandwich | Dekalb | Landline | Frontier North, Inc. Il |
| 815-787 | Dekalb | Dekalb | Landline | Frontier North, Inc. Il |
| 815-788 | Crystal Lake | McHenry | Landline | Ameritech Illinois |
| 815-789 | Orangeville | Stephenson | Landline | Frontier North, Inc. Il |
| 815-790 | McHenry | McHenry | Cell Phone | Nextel Communications, Inc. |
| 815-791 | New Lenox | Will | Cell Phone | Nextel Communications, Inc. |
| 815-792 | Earlville | La Salle | Landline | Ameritech Illinois |
| 815-793 | Dekalb | Dekalb | Cell Phone | Tmobile Usa, Inc. |
| 815-794 | La Salle | La Salle | Landline | Marseilles Telephone Co. Of... |
| 815-795 | Marseilles | La Salle | Landline | Marseilles Telephone Co. Of... |
| 815-796 | Flanagan | Livingston | Landline | Frontier Communications Of... |
| 815-797 | Crystal Lake | McHenry | Landline | Level 3 Communications, Llc... |
| 815-798 | Frankfort | Will | Landline | Essex Telcom, Inc. |
| 815-799 | Manlius | Bureau | Landline | Sprint Communications Compa... |
| 815-801 | Freeport | Stephenson | Landline | Aero North Communications,... |
| 815-802 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-805 | McHenry | McHenry | Landline | Aero North Communications,... |
| 815-806 | Frankfort | Will | Landline | Ameritech Illinois |
| 815-809 | Lena | Stephenson | Landline | Aero North Communications,... |
| 815-814 | Crystal Lake | McHenry | Cell Phone | Tmobile Usa, Inc. |
| 815-816 | Paw Paw | Lee | Landline | Aero North Communications,... |
| 815-818 | Warren | Jo Daviess | Landline | Aero North Communications,... |
| 815-819 | Orangeville | Stephenson | Landline | Aero North Communications,... |
| 815-820 | Plainfield | Will | Landline | Aero North Communications,... |
| 815-821 | Elizabeth | Jo Daviess | Landline | United States Cellular Corp... |
| 815-822 | Streator | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-823 | Crest Hill | Will | Landline | Xo Illinois, Inc. |
| 815-824 | Shabbona | Dekalb | Landline | Frontier North, Inc. Il |
| 815-825 | Malta | Dekalb | Landline | Frontier North, Inc. Il |
| 815-826 | Somonauk | Dekalb | Cell Phone | Cellco Partnership Dba Veri... |
| 815-827 | Maple Park | Kane | Landline | Frontier North, Inc. Il |
| 815-828 | Minooka | Grundy | Landline | Xo Illinois, Inc. |
| 815-829 | Rockford | Winnebago | Landline | Essex Telcom, Inc. |
| 815-830 | Ottawa | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-831 | Plainfield | Will | Landline | Aero North Communications,... |
| 815-832 | Saunemin | Livingston | Landline | Frontier Communications Of... |
| 815-834 | Lockport | Will | Landline | Ameritech Illinois |
| 815-835 | Dixon | Lee | Landline | Essex Telcom, Inc. |
| 815-836 | Lockport | Will | Landline | Ameritech Illinois |
| 815-837 | Pecatonica | Winnebago | Landline | Aero North Communications,... |
| 815-838 | Lockport | Will | Landline | Ameritech Illinois |
| 815-839 | Crystal Lake | McHenry | Landline | Xo Illinois, Inc. |
| 815-840 | Dwight | Livingston | Landline | Aero North Communications,... |
| 815-841 | Frankfort | Will | Landline | Essex Telcom, Inc. |
| 815-842 | Pontiac | Livingston | Landline | Frontier North, Inc. Il |
| 815-844 | Pontiac | Livingston | Landline | Frontier North, Inc. Il |
| 815-845 | Scales Mound | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-846 | Joliet | Will | Landline | Broadwing Communications, L... |
| 815-847 | Rockford | Winnebago | Landline | Sbc Internet Services, Inc. |
| 815-848 | Homer Glen | Will | Landline | Illinois Valley Cellular Rs... |
| 815-849 | Sublette | Lee | Landline | Frontier North, Inc. Il |
| 815-850 | Morris | Grundy | Landline | Aero North Communications,... |
| 815-851 | Plainfield | Will | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-852 | Ottawa | La Salle | Landline | Aero North Communications,... |
| 815-853 | Wenona | Marshall | Landline | Frontier North, Inc. Il |
| 815-854 | Long Point | Livingston | Landline | Frontier North, Inc. Il |
| 815-856 | Leonore | La Salle | Landline | Leonore Mutual Telephone Co. |
| 815-857 | Amboy | Lee | Landline | Frontier North, Inc. Il |
| 815-858 | Elizabeth | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-859 | Apple River | Jo Daviess | Landline | Essex Telcom, Inc. |
| 815-860 | New Lenox | Will | Landline | Teleport Communications Gro... |
| 815-861 | Woodstock | McHenry | Cell Phone | New Cingular Wireless Pcs,... |
| 815-862 | Dekalb | Dekalb | Landline | Charter Fiberlink Illinoi... |
| 815-863 | Rutland | La Salle | Landline | Frontier North, Inc. Il |
| 815-864 | Shannon | Carroll | Landline | Citizens Telecom Co Illinoi... |
| 815-865 | Davis | Stephenson | Landline | Frontier North, Inc. Il |
| 815-866 | Mendota | La Salle | Landline | Illinois Valley Cellular Rs... |
| 815-867 | Pontiac | Livingston | Cell Phone | Nextel Communications, Inc. |
| 815-868 | Mc Connell | Stephenson | Landline | Frontier North, Inc. Il |
| 815-869 | Magnolia | Putnam | Landline | Frontier North, Inc. Il |
| 815-870 | Rockford | Winnebago | Cell Phone | Usa Mobility Wireless, Inc. |
| 815-871 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-872 | Princeton | Bureau | Landline | Frontier North, Inc. Il |
| 815-873 | Rockford | Winnebago | Landline | Frontier North, Inc. Il |
| 815-874 | Rockford | Winnebago | Landline | Frontier North, Inc. Il |
| 815-875 | Princeton | Bureau | Landline | Frontier North, Inc. Il |
| 815-876 | Princeton | Bureau | Landline | Frontier North, Inc. Il |
| 815-877 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-878 | Princeton | Bureau | Cell Phone | New Cingular Wireless Pcs,... |
| 815-879 | Princeton | Bureau | Landline | Frontier North, Inc. Il |
| 815-880 | Plainfield | Will | Landline | Xo Illinois, Inc. |
| 815-881 | Oregon | Ogle | Landline | Essex Telcom, Inc. |
| 815-882 | Mc Nabb | Putnam | Landline | Mcnabb Telephone Co. |
| 815-883 | Oglesby | La Salle | Landline | Ameritech Illinois |
| 815-884 | Kankakee | Kankakee | Landline | Mediacom Telephony Of Illin... |
| 815-885 | Loves Park | Winnebago | Landline | Frontier North, Inc. Il |
| 815-886 | Romeoville | Will | Landline | Ameritech Illinois |
| 815-887 | Harvard | McHenry | Landline | Teleport Communications Gro... |
| 815-889 | Milford | Iroquois | Landline | Frontier Communications Of... |
| 815-890 | Plainfield | Will | Landline | Aero North Communications,... |
| 815-891 | Crystal Lake | McHenry | Landline | Aero North Communications,... |
| 815-892 | Hinckley | Dekalb | Landline | Essex Telcom, Inc. |
| 815-893 | Crystal Lake | McHenry | Landline | Comcast Phone Of Illinois,... |
| 815-894 | Ladd | Bureau | Landline | Frontier North, Inc. Il |
| 815-895 | Sycamore | Dekalb | Landline | Frontier North, Inc. Il |
| 815-896 | Galena | Jo Daviess | Landline | Aero North Communications,... |
| 815-897 | Lyndon | Whiteside | Landline | Sprint Communications Compa... |
| 815-898 | Plainfield | Will | Landline | Aero North Communications,... |
| 815-899 | Sycamore | Dekalb | Landline | Frontier North, Inc. Il |
| 815-901 | Dekalb | Dekalb | Landline | Comcast Phone Of Illinois,... |
| 815-902 | Thomson | Carroll | Landline | Sprint Communications Compa... |
| 815-904 | Rockford | Winnebago | Cell Phone | New Cingular Wireless Pcs,... |
| 815-906 | Mount Carroll | Carroll | Landline | Sprint Communications Compa... |
| 815-907 | Manteno | Kankakee | Landline | Broadwing Communications, L... |
| 815-908 | Shorewood | Will | Landline | Sprint Communications Compa... |
| 815-909 | Cortland | Dekalb | Landline | Sprint Communications Compa... |
| 815-910 | Mendota | La Salle | Landline | Illinois Valley Cellular Rs... |
| 815-913 | Chadwick | Carroll | Landline | Sprint Communications Compa... |
| 815-914 | Rockford | Winnebago | Cell Phone | Sprint Spectrum L.p. |
| 815-915 | Princeton | Bureau | Landline | Level 3 Communications, Llc... |
| 815-918 | Clifton | Iroquois | Landline | Level 3 Communications, Llc... |
| 815-919 | Joliet | Will | Cell Phone | Tmobile Usa, Inc. |
| 815-920 | Cornell | Livingston | Landline | Sprint Communications Compa... |
| 815-921 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-922 | Kankakee | Kankakee | Cell Phone | Cellco Partnership Dba Veri... |
| 815-923 | Union | McHenry | Landline | Ameritech Illinois |
| 815-924 | South Beloit | Winnebago | Landline | Essex Telcom, Inc. |
| 815-925 | Hennepin | Putnam | Landline | Frontier North, Inc. Il |
| 815-926 | Wilmington | Will | Landline | Broadwing Communications, L... |
| 815-927 | Joliet | Will | Landline | Broadwing Communications, L... |
| 815-928 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-929 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-930 | Elizabeth | Jo Daviess | Landline | Sprint Communications Compa... |
| 815-931 | Crest Hill | Will | Cell Phone | New Cingular Wireless Pcs,... |
| 815-932 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-933 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-934 | Emington | Livingston | Landline | Frontier North, Inc. Il |
| 815-935 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-936 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-937 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-938 | Forreston | Ogle | Landline | Frontier North, Inc. Il |
| 815-939 | Kankakee | Kankakee | Landline | Ameritech Illinois |
| 815-940 | Gardner | Grundy | Landline | Level 3 Communications, Llc... |
| 815-941 | Morris | Grundy | Landline | Ameritech Illinois |
| 815-942 | Morris | Grundy | Landline | Ameritech Illinois |
| 815-943 | Harvard | McHenry | Landline | Ameritech Illinois |
| 815-944 | Saint Anne | Kankakee | Landline | Ameritech Illinois |
| 815-945 | Chenoa | McLean | Landline | Frontier North, Inc. Il |
| 815-946 | Polo | Ogle | Landline | Citizens Telecom Co Illinoi... |
| 815-947 | Stockton | Jo Daviess | Landline | Frontier North, Inc. Il |
| 815-948 | Prophetstown | Whiteside | Landline | Citizens Telecom Co Illinoi... |
| 815-949 | Cabery | Kankakee | Landline | Frontier North, Inc. Il |
| 815-951 | Rockford | Winnebago | Landline | Essex Telcom, Inc. |
| 815-952 | Manhattan | Will | Landline | Aero North Communications,... |
| 815-953 | Kankakee | Kankakee | Cell Phone | Cellco Partnership Dba Veri... |
| 815-954 | Kankakee | Kankakee | Cell Phone | Cellco Partnership Dba Veri... |
| 815-955 | Romeoville | Will | Cell Phone | Nextel Communications, Inc. |
| 815-956 | Morrison | Whiteside | Landline | Sprint Communications Compa... |
| 815-957 | Rockton | Winnebago | Landline | Level 3 Communications, Llc... |
| 815-960 | Crystal Lake | McHenry | Landline | North County Communications... |
| 815-961 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-962 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-963 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-964 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-965 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-966 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-967 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-968 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-969 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-970 | Cortland | Dekalb | Cell Phone | Nextel Communications, Inc. |
| 815-971 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-972 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-973 | Dixon | Lee | Landline | United States Cellular Corp... |
| 815-974 | Joliet | Will | Landline | Essex Telcom, Inc. |
| 815-975 | Belvidere | Boone | Cell Phone | New Cingular Wireless Pcs,... |
| 815-976 | Northbrook | Cook | Landline | Unknown |
| 815-977 | Rockford | Winnebago | Landline | Mci Worldcom Communications... |
| 815-978 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-979 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-980 | Northbrook | Cook | Cell Phone | Cellco Partnership Dba Veri... |
| 815-981 | Dekalb | Dekalb | Landline | Level 3 Communications, Llc... |
| 815-982 | Rockford | Winnebago | Landline | Essex Telcom, Inc. |
| 815-983 | Rockford | Winnebago | Landline | American Messaging (am), Inc. |
| 815-984 | Wellington | Iroquois | Landline | Frontier Communications Of... |
| 815-985 | Rockford | Winnebago | Cell Phone | Cellco Partnership Dba Veri... |
| 815-986 | Rockford | Winnebago | Landline | Us Xchange Of Illinois Llc... |
| 815-987 | Rockford | Winnebago | Landline | Ameritech Illinois |
| 815-988 | Rockford | Winnebago | Landline | United States Cellular Corp... |
| 815-989 | Prophetstown | Whiteside | Landline | Sprint Communications Compa... |
| 815-990 | Freeport | Stephenson | Cell Phone | Cellco Partnership Dba Veri... |
| 815-991 | Sycamore | Dekalb | Landline | Essex Telcom, Inc. |
| 815-992 | Streator | La Salle | Cell Phone | Nextel Communications, Inc. |
| 815-993 | Oglesby | La Salle | Cell Phone | New Cingular Wireless Pcs,... |
| 815-994 | Dixon | Lee | Cell Phone | Nextel Communications, Inc. |
| 815-997 | Rockford | Winnebago | Landline | Mcleodusa Telecommunication... |
| 815-998 | Odell | Livingston | Landline | Frontier North, Inc. Il |
| 815-999 | Schaumburg | Cook | Landline | United States Cellular Corp... |