| Prefixes | City | County | Line Type | Company |
|---|---|---|---|---|
| 231-123 | Charlestown | Suffolk | Unknown | |
| 231-206 | Muskegon | Muskegon | Cell Phone | Nextel Communications, Inc. |
| 231-207 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-209 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-215 | Muskegon | Muskegon | Cell Phone | Cellco Partnership Dba Veri... |
| 231-218 | Traverse City | Grand Traverse | Cell Phone | Nextel Communications, Inc. |
| 231-219 | Big Rapids | Mecosta | Landline | Telnet Worldwide, Inc. |
| 231-220 | Muskegon | Muskegon | Landline | Local Exchange Carriers Of... |
| 231-221 | Muskegon | Muskegon | Landline | Unknown |
| 231-222 | East Jordan | Charlevoix | Landline | Level 3 Communications, Llc... |
| 231-223 | Traverse City | Grand Traverse | Landline | Peninsula Telephone Co. |
| 231-224 | Suttons Bay | Leelanau | Landline | Lucre, Inc. |
| 231-225 | Grand Rapids | Kent | Landline | Level 3 Communications, Llc... |
| 231-228 | Cedar | Leelanau | Landline | Centurytel Of Michigan Inc... |
| 231-229 | Lake City | Missaukee | Landline | Centurytel Of Michigan Inc... |
| 231-232 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-233 | Ludington | Mason | Cell Phone | Alltel Communications, Inc.... |
| 231-234 | Grand Rapids | Kent | Landline | Unknown |
| 231-235 | Muskegon | Muskegon | Landline | Telnet Worldwide, Inc. |
| 231-236 | Muskegon | Muskegon | Landline | Telnet Worldwide, Inc. |
| 231-237 | Charlevoix | Charlevoix | Landline | Ameritech Michigan |
| 231-238 | Indian River | Cheboygan | Landline | Ameritech Michigan |
| 231-239 | Ludington | Mason | Cell Phone | Centurytel Wireless, Inc.mi |
| 231-240 | Ludington | Mason | Landline | Telnet Worldwide, Inc. |
| 231-241 | Muskegon | Muskegon | Landline | Daystarr, Llc Dba Daystarr... |
| 231-242 | Harbor Springs | Emmet | Landline | Ameritech Michigan |
| 231-243 | Lake Leelanau | Leelanau | Landline | Telnet Worldwide, Inc. |
| 231-248 | San Dimas | Los Angeles | Landline | Unknown |
| 231-249 | Ludington | Mason | Landline | Lucre, Inc. |
| 231-250 | Big Rapids | Mecosta | Cell Phone | Alltel Communications, Inc.... |
| 231-256 | Lake Leelanau | Leelanau | Landline | Ameritech Michigan |
| 231-258 | Kalkaska | Kalkaska | Landline | Ameritech Michigan |
| 231-259 | Shelby | Oceana | Landline | Charter Fiberlink Michiga... |
| 231-262 | Grant | Newaygo | Landline | Acd Telecom, Inc. Mi |
| 231-263 | Kingsley | Grand Traverse | Landline | Century Tel Co Northern Mic... |
| 231-264 | Elk Rapids | Antrim | Landline | Ameritech Michigan |
| 231-266 | Irons | Lake | Landline | Ameritech Michigan |
| 231-267 | Williamsburg | Grand Traverse | Landline | Ameritech Michigan |
| 231-268 | Cheboygan | Cheboygan | Cell Phone | Cellco Partnership Dba Veri... |
| 231-269 | Buckley | Wexford | Landline | Ace Telephone Co. Of Michig... |
| 231-271 | Suttons Bay | Leelanau | Landline | Centurytel Of Michigan Inc... |
| 231-275 | Interlochen | Grand Traverse | Landline | Centurytel Of Michigan Inc... |
| 231-276 | Grawn | Grand Traverse | Landline | Ameritech Michigan |
| 231-282 | Grant | Newaygo | Cell Phone | New Cingular Wireless Pcs,... |
| 231-286 | Muskegon | Muskegon | Cell Phone | Cellco Partnership Dba Veri... |
| 231-287 | Newaygo | Newaygo | Cell Phone | Centurytel Wireless, Inc.mi |
| 231-288 | Muskegon | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-290 | Mackinac Island | Mackinac | Cell Phone | New Cingular Wireless Pcs,... |
| 231-292 | Big Rapids | Mecosta | Landline | Charter Fiberlink Michiga... |
| 231-293 | Spring Lake | Ottawa | Landline | Unknown |
| 231-294 | Fremont | Newaygo | Landline | Unknown |
| 231-296 | Grand Haven | Ottawa | Landline | Unknown |
| 231-301 | Hart | Oceana | Cell Phone | Cellco Partnership Dba Veri... |
| 231-307 | Morley | Mecosta | Cell Phone | Centennial Michiana License... |
| 231-308 | Manistee | Manistee | Landline | Telnet Worldwide, Inc. |
| 231-313 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-316 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-318 | Coopersville | Ottawa | Cell Phone | Usa Mobility Wireless, Inc. |
| 231-322 | Rapid City | Kalkaska | Landline | Frontier North, Inc. Mi |
| 231-323 | Newaygo | Newaygo | Landline | Lucre, Inc. |
| 231-325 | Honor | Benzie | Landline | Centurytel Of Michigan Inc... |
| 231-326 | Empire | Leelanau | Landline | Centurytel Of Michigan Inc... |
| 231-327 | Muskegon | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-328 | Merritt | Missaukee | Landline | Centurytel Of Michigan Inc... |
| 231-329 | Muskegon | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-330 | Petoskey | Emmet | Cell Phone | Cellco Partnership Dba Veri... |
| 231-331 | Alden | Antrim | Landline | Frontier North, Inc. Mi |
| 231-332 | Muskegon | Muskegon | Landline | Telnet Worldwide, Inc. |
| 231-333 | Cheboygan | Cheboygan | Landline | Level 3 Communications, Llc... |
| 231-334 | Glen Arbor | Leelanau | Landline | Centurytel Of Michigan Inc... |
| 231-335 | Fremont | Newaygo | Cell Phone | Centennial Michiana License... |
| 231-337 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-338 | Traverse City | Grand Traverse | Landline | Lucre, Inc. |
| 231-340 | Bedford | Bedford | Cell Phone | Cellco Partnership Dba Veri... |
| 231-342 | Traverse City | Grand Traverse | Cell Phone | Cellco Partnership Dba Veri... |
| 231-343 | Muskegon | Muskegon | Cell Phone | Sprint Spectrum L.p. |
| 231-344 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-345 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-346 | Glen Arbor | Leelanau | Landline | Telnet Worldwide, Inc. |
| 231-347 | Petoskey | Emmet | Landline | Ameritech Michigan |
| 231-348 | Petoskey | Emmet | Landline | Ameritech Michigan |
| 231-349 | Grand Rapids | Kent | Cell Phone | Alltel Communications, Inc.... |
| 231-350 | Bellaire | Antrim | Cell Phone | Cellco Partnership Dba Veri... |
| 231-351 | Reed City | Osceola | Landline | Telnet Worldwide, Inc. |
| 231-352 | Frankfort | Benzie | Landline | Ameritech Michigan |
| 231-353 | Baraga | Baraga | Landline | Telnet Worldwide, Inc. |
| 231-354 | Coral | Montcalm | Landline | Ameritech Michigan |
| 231-355 | White Cloud | Newaygo | Landline | Telnet Worldwide, Inc. |
| 231-356 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-357 | Traverse City | Grand Traverse | Cell Phone | Cellco Partnership Dba Veri... |
| 231-358 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-360 | Glen Arbor | Leelanau | Cell Phone | New Cingular Wireless Pcs,... |
| 231-361 | Reed City | Osceola | Landline | Telnet Worldwide, Inc. |
| 231-362 | Kaleva | Manistee | Landline | Kaleva Telephone Company |
| 231-363 | Whitehall | Muskegon | Landline | Telnet Worldwide, Inc. |
| 231-364 | Grand Rapids | Kent | Landline | Unknown |
| 231-365 | Eastport | Antrim | Landline | Telnet Worldwide, Inc. |
| 231-366 | Fruitport | Muskegon | Landline | Level 3 Communications, Llc... |
| 231-368 | Fife Lake | Kalkaska | Landline | Telnet Worldwide, Inc. |
| 231-369 | South Boardman | Kalkaska | Landline | Ace Telephone Co. Of Michig... |
| 231-372 | Cadillac | Wexford | Landline | Telnet Worldwide, Inc. |
| 231-377 | Bellaire | Antrim | Landline | Frontier North, Inc. Mi |
| 231-378 | Thompsonville | Benzie | Landline | Ace Telephone Co. Of Michig... |
| 231-381 | Franklin | Oakland | Landline | Unknown |
| 231-383 | Beulah | Benzie | Cell Phone | Alltel Communications, Inc.... |
| 231-384 | Kalkaska | Kalkaska | Cell Phone | Cellco Partnership Dba Veri... |
| 231-386 | Northport | Leelanau | Landline | Ameritech Michigan |
| 231-388 | Montague | Muskegon | Cell Phone | Alltel Communications, Inc.... |
| 231-389 | Harrietta | Wexford | Landline | Ameritech Michigan |
| 231-392 | Traverse City | Grand Traverse | Cell Phone | Sprint Spectrum L.p. |
| 231-396 | Holland | Ottawa | Landline | Unknown |
| 231-398 | Manistee | Manistee | Landline | Ameritech Michigan |
| 231-399 | Frankfort | Benzie | Landline | Acd Telecom, Inc. Mi |
| 231-408 | Muskegon | Muskegon | Cell Phone | Centennial Michiana License... |
| 231-409 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-414 | Newaygo | Newaygo | Cell Phone | New Cingular Wireless Pcs,... |
| 231-420 | Cheboygan | Cheboygan | Cell Phone | Cellco Partnership Dba Veri... |
| 231-421 | Traverse City | Grand Traverse | Landline | Charter Fiberlink Michiga... |
| 231-423 | Cheboygan | Cheboygan | Landline | Lucre, Inc. |
| 231-424 | Big Rapids | Mecosta | Landline | Acd Telecom, Inc. Mi |
| 231-425 | Ludington | Mason | Cell Phone | Nextel Communications, Inc. |
| 231-432 | Northport | Leelanau | Cell Phone | New Cingular Wireless Pcs,... |
| 231-433 | Muskegon | Muskegon | Cell Phone | Verizon Wireless (vaw), Llc |
| 231-435 | Mackinaw City | Cheboygan | Landline | Lucre, Inc. |
| 231-436 | Mackinaw City | Cheboygan | Landline | Ameritech Michigan |
| 231-437 | Charlevoix | Charlevoix | Cell Phone | Nextel Communications, Inc. |
| 231-438 | Harbor Springs | Emmet | Landline | Lucre, Inc. |
| 231-439 | Petoskey | Emmet | Landline | Ameritech Michigan |
| 231-441 | Muskegon | Muskegon | Landline | Local Exchange Carriers Of... |
| 231-448 | Beaver Island | Charlevoix | Landline | Island Telephone Co. |
| 231-449 | Spring Lake | Ottawa | Landline | Unknown |
| 231-452 | Newaygo | Newaygo | Landline | Lucre, Inc. |
| 231-453 | Spring Lake | Ottawa | Landline | Unknown |
| 231-456 | Muskegon | Muskegon | Landline | Unknown |
| 231-457 | Muskegon | Muskegon | Landline | Acd Telecom, Inc. Mi |
| 231-459 | Boyne City | Charlevoix | Landline | Long Distance Of Michigan,... |
| 231-462 | Fountain | Mason | Landline | Ameritech Michigan |
| 231-463 | Glen Arbor | Leelanau | Cell Phone | Cellco Partnership Dba Veri... |
| 231-464 | Free Soil | Mason | Landline | Ameritech Michigan |
| 231-465 | Reed City | Osceola | Cell Phone | Centennial Michiana License... |
| 231-468 | Cadillac | Wexford | Cell Phone | Sprint Spectrum L.p. |
| 231-470 | Muskegon | Muskegon | Landline | Unknown |
| 231-477 | Brethren | Manistee | Landline | Kaleva Telephone Company |
| 231-480 | Ludington | Mason | Landline | Level 3 Communications, Llc... |
| 231-485 | Mesick | Wexford | Landline | Unknown |
| 231-486 | Traverse City | Grand Traverse | Landline | Brooks Fiber Communications... |
| 231-487 | Petoskey | Emmet | Landline | Ameritech Michigan |
| 231-488 | Alanson | Emmet | Landline | Local Exchange Carriers Of... |
| 231-492 | Benton Harbor | Berrien | Cell Phone | Cellco Partnership Dba Veri... |
| 231-498 | Elk Rapids | Antrim | Landline | Level 3 Communications, Llc... |
| 231-499 | Traverse City | Grand Traverse | Cell Phone | Cellco Partnership Dba Veri... |
| 231-510 | Ludington | Mason | Cell Phone | New Cingular Wireless Pcs,... |
| 231-515 | Evart | Osceola | Landline | Acd Telecom, Inc. Mi |
| 231-518 | Kalkaska | Kalkaska | Landline | Level 3 Communications, Llc... |
| 231-519 | Newaygo | Newaygo | Cell Phone | Alltel Communications, Inc.... |
| 231-520 | Howard City | Montcalm | Landline | Local Exchange Carriers Of... |
| 231-525 | Wolverine | Cheboygan | Landline | Ameritech Michigan |
| 231-526 | Harbor Springs | Emmet | Landline | Ameritech Michigan |
| 231-527 | Big Rapids | Mecosta | Landline | Ameritech Michigan |
| 231-529 | Brutus | Emmet | Landline | Centurytel Of Michigan Inc... |
| 231-533 | Bellaire | Antrim | Landline | Frontier North, Inc. Mi |
| 231-534 | Acme | Grand Traverse | Landline | At&t Local |
| 231-535 | Boyne Falls | Charlevoix | Landline | Ameritech Michigan |
| 231-536 | East Jordan | Charlevoix | Landline | Ameritech Michigan |
| 231-537 | Levering | Emmet | Landline | Centurytel Of Michigan Inc... |
| 231-539 | Pellston | Emmet | Landline | Ameritech Michigan |
| 231-543 | Grand Rapids | Kent | Landline | Lucre, Inc. |
| 231-544 | Central Lake | Antrim | Landline | Frontier North, Inc. Mi |
| 231-546 | Gaylord | Otsego | Landline | Centurytel Of Michigan Inc... |
| 231-547 | Charlevoix | Charlevoix | Landline | Ameritech Michigan |
| 231-548 | Alanson | Emmet | Landline | Centurytel Of Michigan Inc... |
| 231-549 | Boyne Falls | Charlevoix | Landline | Centurytel Of Michigan Inc... |
| 231-553 | Bellaire | Antrim | Landline | Unknown |
| 231-555 | Cheboygan | Cheboygan | Landline | Unknown |
| 231-557 | Muskegon | Muskegon | Cell Phone | Cellco Partnership Dba Veri... |
| 231-563 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-564 | Alden | Antrim | Cell Phone | New Cingular Wireless Pcs,... |
| 231-570 | Fife Lake | Kalkaska | Cell Phone | New Cingular Wireless Pcs,... |
| 231-571 | Grand Haven | Ottawa | Landline | Frontier North, Inc. Mi |
| 231-577 | Cadillac | Wexford | Landline | Level 3 Communications, Llc... |
| 231-578 | Muskegon | Muskegon | Cell Phone | Nextel Communications, Inc. |
| 231-579 | Muskegon | Muskegon | Landline | Unknown |
| 231-580 | Big Rapids | Mecosta | Cell Phone | Sprint Spectrum L.p. |
| 231-582 | Boyne City | Charlevoix | Landline | Ameritech Michigan |
| 231-583 | Central Lake | Antrim | Landline | Local Exchange Carriers Of... |
| 231-584 | Elmira | Antrim | Landline | Pigeon Telephone Co. |
| 231-585 | Gaylord | Otsego | Landline | Pigeon Telephone Co. |
| 231-587 | Mancelona | Antrim | Landline | Ameritech Michigan |
| 231-588 | Ellsworth | Antrim | Landline | Frontier North, Inc. Mi |
| 231-590 | Glen Arbor | Leelanau | Cell Phone | Cellco Partnership Dba Veri... |
| 231-591 | Big Rapids | Mecosta | Landline | Ameritech Michigan |
| 231-592 | Big Rapids | Mecosta | Landline | Ameritech Michigan |
| 231-593 | Bellaire | Antrim | Cell Phone | Usa Mobility Wireless, Inc. |
| 231-597 | Cheboygan | Cheboygan | Landline | Ameritech Michigan |
| 231-598 | Big Rapids | Mecosta | Cell Phone | Centennial Michiana License... |
| 231-599 | Kewadin | Antrim | Landline | Frontier North, Inc. Mi |
| 231-613 | Montague | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-620 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-622 | Petoskey | Emmet | Landline | Level 3 Communications, Llc... |
| 231-623 | Grand Rapids | Kent | Landline | Lucre, Inc. |
| 231-624 | Gaylord | Otsego | Cell Phone | Nextel Communications, Inc. |
| 231-625 | Cheboygan | Cheboygan | Landline | Ameritech Michigan |
| 231-627 | Cheboygan | Cheboygan | Landline | Ameritech Michigan |
| 231-629 | Big Rapids | Mecosta | Cell Phone | Nextel Communications, Inc. |
| 231-631 | Traverse City | Grand Traverse | Cell Phone | Cellco Partnership Dba Veri... |
| 231-632 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-633 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-634 | Pointe Aux Pins | Mackinac | Landline | Island Telephone Co. |
| 231-636 | Fremont | Newaygo | Landline | Local Exchange Carriers Of... |
| 231-637 | Grand Rapids | Kent | Landline | Telnet Worldwide, Inc. |
| 231-638 | Muskegon | Muskegon | Cell Phone | Nextel Communications, Inc. |
| 231-639 | Coopersville | Ottawa | Landline | Local Exchange Carriers Of... |
| 231-642 | Traverse City | Grand Traverse | Cell Phone | Nextel Communications, Inc. |
| 231-643 | Saint Ignace | Mackinac | Landline | Local Exchange Carriers Of... |
| 231-645 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-646 | Sears | Osceola | Landline | Frontier North, Inc. Mi |
| 231-647 | Howard City | Montcalm | Landline | Telnet Worldwide, Inc. |
| 231-648 | Howard City | Montcalm | Landline | Lucre, Inc. |
| 231-649 | Glen Arbor | Leelanau | Cell Phone | Cellco Partnership Dba Veri... |
| 231-651 | Northport | Leelanau | Cell Phone | New Cingular Wireless Pcs,... |
| 231-652 | Newaygo | Newaygo | Landline | Ameritech Michigan |
| 231-656 | Harbor Springs | Emmet | Landline | Local Exchange Carriers Of... |
| 231-657 | Marietta | Cobb | Landline | Unknown |
| 231-659 | Newaygo | Newaygo | Landline | Unknown |
| 231-660 | Grand Rapids | Kent | Landline | Local Exchange Carriers Of... |
| 231-663 | Ann Arbor | Washtenaw | Landline | Unknown |
| 231-668 | Traverse City | Grand Traverse | Landline | Level 3 Communications, Llc... |
| 231-670 | Muskegon | Muskegon | Cell Phone | Cellco Partnership Dba Veri... |
| 231-672 | Muskegon | Muskegon | Landline | At&t Local |
| 231-674 | Grant | Newaygo | Landline | Level 3 Communications, Llc... |
| 231-675 | Charlevoix | Charlevoix | Cell Phone | New Cingular Wireless Pcs,... |
| 231-676 | Mancelona | Antrim | Cell Phone | New Cingular Wireless Pcs,... |
| 231-677 | Alanson | Emmet | Landline | Unknown |
| 231-678 | Fruitport | Muskegon | Landline | Acd Telecom, Inc. Mi |
| 231-679 | Big Rapids | Mecosta | Cell Phone | Alltel Communications, Inc.... |
| 231-681 | Petoskey | Emmet | Landline | Frontier North, Inc. Mi |
| 231-682 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-683 | Muskegon | Muskegon | Landline | Level 3 Communications, Llc... |
| 231-686 | Traverse City | Grand Traverse | Landline | Local Exchange Carriers Of... |
| 231-689 | White Cloud | Newaygo | Landline | Ameritech Michigan |
| 231-690 | Ludington | Mason | Cell Phone | Alltel Communications, Inc.... |
| 231-695 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-697 | Petoskey | Emmet | Landline | Lucre, Inc. |
| 231-698 | Traverse City | Grand Traverse | Landline | Lucre, Inc. |
| 231-709 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-715 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-719 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-720 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-721 | Mecosta | Mecosta | Landline | Local Exchange Carriers Of... |
| 231-722 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-723 | Manistee | Manistee | Landline | Ameritech Michigan |
| 231-724 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-725 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-726 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-727 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-728 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-730 | Muskegon | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-731 | Traverse City | Grand Traverse | Landline | Lucre, Inc. |
| 231-732 | Elmira | Antrim | Landline | Lucre, Inc. |
| 231-733 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-734 | Evart | Osceola | Landline | Ameritech Michigan |
| 231-736 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-737 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-739 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-740 | Muskegon | Muskegon | Cell Phone | Cellco Partnership Dba Veri... |
| 231-743 | Marion | Osceola | Landline | Ameritech Michigan |
| 231-744 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-745 | Baldwin | Lake | Landline | Ameritech Michigan |
| 231-747 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-750 | Muskegon | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-752 | Muskegon | Muskegon | Landline | Unknown |
| 231-753 | Petoskey | Emmet | Landline | Long Distance Of Michigan,... |
| 231-754 | Cadillac | Wexford | Landline | Lucre, Inc. |
| 231-755 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-757 | Scottville | Mason | Landline | Ameritech Michigan |
| 231-758 | Petoskey | Emmet | Cell Phone | Nextel Communications, Inc. |
| 231-759 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-760 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-761 | Muskegon | Muskegon | Landline | Unknown |
| 231-762 | Howard City | Montcalm | Landline | Upper Peninsula Telephone Co. |
| 231-764 | Traverse City | Grand Traverse | Landline | Telnet Worldwide, Inc. |
| 231-766 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-767 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-768 | Leroy | Osceola | Landline | Ameritech Michigan |
| 231-769 | Montague | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-773 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-774 | Stanwood | Mecosta | Landline | Acd Telecom, Inc. Mi |
| 231-775 | Cadillac | Wexford | Landline | Ameritech Michigan |
| 231-776 | Muskegon | Muskegon | Landline | Local Exchange Carriers Of... |
| 231-777 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-778 | Hart | Oceana | Landline | Local Exchange Carriers Of... |
| 231-779 | Cadillac | Wexford | Landline | Ameritech Michigan |
| 231-780 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-782 | Hesperia | Oceana | Landline | Local Exchange Carriers Of... |
| 231-785 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-788 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-789 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-791 | Merritt | Missaukee | Landline | Long Distance Of Michigan,... |
| 231-792 | Petoskey | Emmet | Landline | Local Exchange Carriers Of... |
| 231-793 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-794 | Manistee | Manistee | Cell Phone | New Cingular Wireless Pcs,... |
| 231-795 | Big Rapids | Mecosta | Landline | Unknown |
| 231-796 | Big Rapids | Mecosta | Landline | Ameritech Michigan |
| 231-797 | Luther | Lake | Landline | Ameritech Michigan |
| 231-798 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-799 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-800 | Traverse City | Grand Traverse | Landline | Unknown |
| 231-803 | Charlevoix | Charlevoix | Landline | Level 3 Communications, Llc... |
| 231-805 | Muskegon | Muskegon | Landline | Acd Telecom, Inc. Mi |
| 231-806 | Traverse City | Grand Traverse | Landline | Local Exchange Carriers Of... |
| 231-813 | Twin Lake | Muskegon | Landline | Lucre, Inc. |
| 231-818 | Cheboygan | Cheboygan | Cell Phone | New Cingular Wireless Pcs,... |
| 231-820 | Los Angeles | Los Angeles | Landline | Unknown |
| 231-821 | Holton | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-822 | Muskegon | Muskegon | Landline | Telnet Worldwide, Inc. |
| 231-823 | Stanwood | Mecosta | Landline | Frontier North, Inc. Mi |
| 231-824 | Manton | Wexford | Landline | Ameritech Michigan |
| 231-825 | Mc Bain | Missaukee | Landline | Ameritech Michigan |
| 231-826 | Falmouth | Missaukee | Landline | Century Tel Co Northern Mic... |
| 231-828 | Twin Lake | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-829 | Tustin | Osceola | Landline | Ameritech Michigan |
| 231-830 | Muskegon | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-832 | Reed City | Osceola | Landline | Ameritech Michigan |
| 231-834 | Grant | Newaygo | Landline | Ameritech Michigan |
| 231-836 | Indian River | Cheboygan | Landline | Local Exchange Carriers Of... |
| 231-837 | Grand Rapids | Kent | Landline | American Messaging (am), Inc. |
| 231-838 | Petoskey | Emmet | Cell Phone | New Cingular Wireless Pcs,... |
| 231-839 | Lake City | Missaukee | Landline | Centurytel Of Michigan Inc... |
| 231-842 | Grand Rapids | Kent | Landline | Local Exchange Carriers Of... |
| 231-843 | Ludington | Mason | Landline | Frontier North, Inc. Mi |
| 231-844 | Spring Lake | Ottawa | Landline | Level 3 Communications, Llc... |
| 231-845 | Ludington | Mason | Landline | Frontier North, Inc. Mi |
| 231-846 | Petoskey | Emmet | Cell Phone | Nextel Communications, Inc. |
| 231-847 | Spring Lake | Ottawa | Landline | Unknown |
| 231-848 | Wellston | Manistee | Landline | Kaleva Telephone Company |
| 231-850 | Grand Haven | Ottawa | Landline | Unknown |
| 231-852 | Ludington | Mason | Cell Phone | New Cingular Wireless Pcs,... |
| 231-853 | Ravenna | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-854 | Hesperia | Oceana | Landline | Frontier North, Inc. Mi |
| 231-855 | Muskegon | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-856 | Morley | Mecosta | Landline | Ameritech Michigan |
| 231-859 | Wellston | Manistee | Landline | Kaleva Telephone Company |
| 231-861 | Shelby | Oceana | Landline | Frontier North, Inc. Mi |
| 231-862 | Cadillac | Wexford | Landline | Ace Telephone Co. Of Michig... |
| 231-863 | Traverse City | Grand Traverse | Landline | Lucre, Inc. |
| 231-864 | Bear Lake | Manistee | Landline | Centurytel Of Michigan Inc... |
| 231-865 | Fruitport | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-866 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-867 | Rodney | Mecosta | Landline | Centurytel Midwestmidwest... |
| 231-869 | Pentwater | Oceana | Landline | Frontier North, Inc. Mi |
| 231-872 | Philadelphia | Philadelphia | Cell Phone | New Cingular Wireless Pcs,... |
| 231-873 | Hart | Oceana | Landline | Frontier North, Inc. Mi |
| 231-875 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-876 | Cadillac | Wexford | Landline | Ameritech Michigan |
| 231-878 | Cadillac | Wexford | Cell Phone | Alltel Communications, Inc.... |
| 231-879 | Fife Lake | Kalkaska | Landline | Ameritech Michigan |
| 231-881 | Petoskey | Emmet | Cell Phone | New Cingular Wireless Pcs,... |
| 231-882 | Beulah | Benzie | Landline | Ameritech Michigan |
| 231-883 | Traverse City | Grand Traverse | Cell Phone | New Cingular Wireless Pcs,... |
| 231-884 | Cadillac | Wexford | Cell Phone | New Cingular Wireless Pcs,... |
| 231-885 | Mesick | Wexford | Landline | Ace Telephone Co. Of Michig... |
| 231-886 | Muskegon | Muskegon | Cell Phone | New Cingular Wireless Pcs,... |
| 231-887 | Manistee | Manistee | Cell Phone | New Cingular Wireless Pcs,... |
| 231-889 | Onekama | Manistee | Landline | Ameritech Michigan |
| 231-890 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-892 | Whitehall | Muskegon | Landline | Unknown |
| 231-893 | Whitehall | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-894 | Whitehall | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-898 | Baldwin | Lake | Landline | Carr Telephone Co. |
| 231-899 | Muskegon | Muskegon | Landline | Local Exchange Carriers Of... |
| 231-903 | Muskegon | Muskegon | Landline | Level 3 Communications, Llc... |
| 231-912 | Big Rapids | Mecosta | Cell Phone | New Cingular Wireless Pcs,... |
| 231-916 | Mancelona | Antrim | Landline | Level 3 Communications, Llc... |
| 231-920 | Cadillac | Wexford | Cell Phone | New Cingular Wireless Pcs,... |
| 231-922 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-923 | Hart | Oceana | Cell Phone | Nextel Communications, Inc. |
| 231-924 | Fremont | Newaygo | Landline | Ameritech Michigan |
| 231-928 | Fremont | Newaygo | Landline | Ameritech Michigan |
| 231-929 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-930 | Beulah | Benzie | Landline | Acd Telecom, Inc. Mi |
| 231-932 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-933 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-935 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-936 | Scottville | Mason | Landline | Long Distance Of Michigan,... |
| 231-937 | Howard City | Montcalm | Landline | Frontier North, Inc. Mi |
| 231-938 | Williamsburg | Grand Traverse | Landline | Ameritech Michigan |
| 231-941 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-943 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-944 | Traverse City | Grand Traverse | Landline | Cynergycomm.net, Inc. Mi |
| 231-946 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-947 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-952 | Traverse City | Grand Traverse | Landline | Unknown |
| 231-955 | Spring Lake | Ottawa | Cell Phone | New Cingular Wireless Pcs,... |
| 231-962 | Muskegon | Muskegon | Landline | Lucre, Inc. |
| 231-972 | Stanwood | Mecosta | Landline | Centurytel Midwestmidwest... |
| 231-974 | Wolverine | Cheboygan | Landline | Local Exchange Carriers Of... |
| 231-981 | Whitehall | Muskegon | Landline | Frontier North, Inc. Mi |
| 231-994 | Leland | Leelanau | Landline | Acd Telecom, Inc. Mi |
| 231-995 | Traverse City | Grand Traverse | Landline | Ameritech Michigan |
| 231-999 | Glen Arbor | Leelanau | Landline | Unknown |