| Prefixes | City | County | Line Type | Company |
|---|---|---|---|---|
| 720-200 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-201 | Boulder | Boulder | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-203 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-204 | Longmont | Boulder | Landline | At&t Local |
| 720-205 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-206 | Englewood | Arapahoe | Landline | Xo Colorado, Llc |
| 720-207 | Aurora | Arapahoe | Landline | Xo Colorado, Llc |
| 720-208 | Englewood | Arapahoe | Landline | Xo Colorado, Llc |
| 720-209 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-210 | Boulder | Boulder | Landline | Xo Colorado, Llc |
| 720-212 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-213 | Aurora | Arapahoe | Landline | Mcleodusa Telecommunication... |
| 720-214 | Denver | Denver | Landline | Mcleodusa Telecommunication... |
| 720-216 | Aurora | Arapahoe | Landline | Teleport Communications Gro... |
| 720-217 | Denver | Denver | Cell Phone | Tmobile Usa, Inc. |
| 720-218 | Englewood | Arapahoe | Cell Phone | Sprint Spectrum L.p. |
| 720-219 | Aurora | Arapahoe | Cell Phone | Cellco Partnership Dba Veri... |
| 720-220 | Denver | Denver | Cell Phone | Tmobile Usa, Inc. |
| 720-221 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-222 | Aurora | Arapahoe | Landline | Xo Colorado, Llc |
| 720-223 | Brighton | Adams | Landline | Xo Colorado, Llc |
| 720-224 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-225 | Lone Tree | Douglas | Landline | Xo Colorado, Llc |
| 720-226 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-227 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-228 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-229 | Arvada | Jefferson | Landline | Xo Colorado, Llc |
| 720-231 | Aurora | Arapahoe | Cell Phone | Tmobile Usa, Inc. |
| 720-232 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-233 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-234 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-235 | Boulder | Boulder | Cell Phone | Sprint Spectrum L.p. |
| 720-236 | Arvada | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-238 | Louisville | Boulder | Cell Phone | Tmobile Usa, Inc. |
| 720-239 | Castle Rock | Douglas | Landline | At&t Local |
| 720-240 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-241 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-244 | Littleton | Jefferson | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-246 | Aurora | Arapahoe | Landline | Xo Colorado, Llc |
| 720-247 | Littleton | Jefferson | Landline | Xo Colorado, Llc |
| 720-248 | Aurora | Arapahoe | Landline | Cbeyond Communications, Llc... |
| 720-249 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-250 | Aurora | Arapahoe | Landline | Xo Colorado, Llc |
| 720-251 | Aurora | Arapahoe | Landline | Level 3 Communications, Llc... |
| 720-252 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-253 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-254 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-255 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-256 | Englewood | Arapahoe | Cell Phone | Sprint Spectrum L.p. |
| 720-257 | Englewood | Arapahoe | Landline | Xo Colorado, Llc |
| 720-258 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-259 | Denver | Denver | Landline | Level 3 Communications, Llc... |
| 720-260 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-261 | Denver | Denver | Cell Phone | Tmobile Usa, Inc. |
| 720-262 | Aurora | Arapahoe | Landline | Icg Telecom Group Co |
| 720-263 | Brighton | Adams | Landline | Level 3 Communications, Llc... |
| 720-264 | Denver | Denver | Landline | Qwest Corporation |
| 720-266 | Littleton | Arapahoe | Landline | Level 3 Communications, Llc... |
| 720-267 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-269 | Aurora | Arapahoe | Landline | Teleport Communications Gro... |
| 720-270 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-271 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-272 | Littleton | Jefferson | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-273 | Littleton | Jefferson | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-274 | Denver | Denver | Landline | Mcleodusa Telecommunication... |
| 720-275 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-276 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-277 | Aurora | Arapahoe | Landline | Icg Telecom Group Co |
| 720-278 | Aurora | Arapahoe | Landline | Tw Telecom Of Colorado Llc... |
| 720-279 | Lone Tree | Douglas | Landline | Tw Telecom Of Colorado Llc... |
| 720-280 | Denver | Denver | Cell Phone | Tmobile Usa, Inc. |
| 720-281 | Aurora | Arapahoe | Cell Phone | Cellco Partnership Dba Veri... |
| 720-282 | Aurora | Arapahoe | Landline | Tw Telecom Of Colorado Llc... |
| 720-283 | Littleton | Arapahoe | Landline | Qwest Corporation |
| 720-284 | Englewood | Arapahoe | Landline | Xo Colorado, Llc |
| 720-285 | Englewood | Arapahoe | Landline | Xo Colorado, Llc |
| 720-286 | Englewood | Arapahoe | Landline | Teleport Communications Gro... |
| 720-289 | Denver | Denver | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-290 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-291 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-293 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-294 | Littleton | Douglas | Landline | Xo Colorado, Llc |
| 720-296 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-297 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-298 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-299 | Englewood | Arapahoe | Cell Phone | Tmobile Usa, Inc. |
| 720-300 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-301 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-302 | Denver | Jefferson | Landline | Teleport Communications Gro... |
| 720-304 | Boulder | Boulder | Landline | Qwest Corporation |
| 720-305 | Denver | Denver | Landline | Tw Telecom Of Colorado Llc... |
| 720-306 | Aurora | Arapahoe | Landline | Eschelon Telecom Of Colorad... |
| 720-308 | Denver | Jefferson | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-309 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-312 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-313 | Boulder | Boulder | Cell Phone | Sprint Spectrum L.p. |
| 720-314 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-317 | Aurora | Arapahoe | Cell Phone | Sprint Spectrum L.p. |
| 720-318 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-319 | Aurora | Arapahoe | Cell Phone | Sprint Spectrum L.p. |
| 720-320 | Littleton | Douglas | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-322 | Commerce City | Adams | Landline | Qwest Corporation |
| 720-323 | Denver | Denver | Cell Phone | Tmobile Usa, Inc. |
| 720-324 | Aurora | Arapahoe | Landline | Comcast Phone Of Colorado,... |
| 720-327 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-329 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-330 | Denver | Denver | Landline | Icg Telecom Group Co |
| 720-331 | Golden | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-332 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-333 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-334 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-335 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-338 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-339 | Aurora | Arapahoe | Cell Phone | Sprint Spectrum L.p. |
| 720-341 | Littleton | Jefferson | Cell Phone | Tmobile Usa, Inc. |
| 720-343 | Aurora | Arapahoe | Landline | Icg Telecom Group Co |
| 720-344 | Littleton | Douglas | Landline | Qwest Corporation |
| 720-345 | Denver | Jefferson | Landline | Zippytech Incorporated |
| 720-346 | Englewood | Arapahoe | Cell Phone | Cellco Partnership Dba Veri... |
| 720-348 | Littleton | Douglas | Landline | Qwest Corporation |
| 720-350 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-351 | Arvada | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-352 | Boulder | Boulder | Cell Phone | Tmobile Usa, Inc. |
| 720-353 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-356 | Denver | Denver | Landline | At&t Local |
| 720-357 | Denver | Denver | Landline | Unknown |
| 720-359 | Denver | Denver | Landline | Qwest Corporation |
| 720-362 | Denver | Denver | Landline | Qwest Corporation |
| 720-363 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-364 | Aurora | Arapahoe | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-365 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-366 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-371 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-373 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-374 | Denver | Denver | Landline | Qwest Corporation |
| 720-375 | Denver | Denver | Cell Phone | Commnet Wireless, Llc |
| 720-377 | Denver | Denver | Landline | Allegiance Telecom Of Color... |
| 720-379 | Denver | Denver | Landline | Icg Telecom Group Co |
| 720-381 | Denver | Denver | Landline | Comcast Phone Of Colorado,... |
| 720-382 | Denver | Denver | Landline | Eschelon Telecom Of Colorad... |
| 720-384 | Castle Rock | Douglas | Landline | Xo Colorado, Llc |
| 720-385 | Denver | Denver | Landline | Xo Colorado, Llc |
| 720-388 | Aurora | Arapahoe | Cell Phone | Cellco Partnership Dba Veri... |
| 720-394 | Denver | Denver | Cell Phone | Tmobile Usa, Inc. |
| 720-404 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-406 | Boulder | Boulder | Landline | Qwest Corporation |
| 720-407 | Denver | Denver | Landline | Cbeyond Communications, Llc... |
| 720-422 | Aurora | Arapahoe | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-423 | Denver | Denver | Landline | Qwest Corporation |
| 720-424 | Denver | Denver | Landline | Qwest Corporation |
| 720-425 | Denver | Denver | Cell Phone | Cellco Partnership Dba Veri... |
| 720-427 | Aurora | Arapahoe | Cell Phone | Tmobile Usa, Inc. |
| 720-428 | Littleton | Jefferson | Landline | Unknown |
| 720-434 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-435 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-436 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-438 | Longmont | Boulder | Landline | 360networks (usa) Inc. Co |
| 720-444 | Littleton | Douglas | Landline | Qwest Corporation |
| 720-447 | Usaf Academy | El Paso | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-448 | Westminster | Adams | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-449 | Aurora | Arapahoe | Landline | Allegiance Telecom Of Color... |
| 720-452 | Boulder | Boulder | Landline | Peerless Network Of Colorad... |
| 720-455 | Denver | Adams | Landline | Qwest Corporation |
| 720-468 | Denver | Denver | Landline | Level 3 Communications, Llc... |
| 720-470 | Littleton | Jefferson | Cell Phone | Cellco Partnership Dba Veri... |
| 720-472 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-475 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-478 | Longmont | Boulder | Landline | Unknown |
| 720-479 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-480 | Denver | Denver | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-481 | Aurora | Arapahoe | Landline | Unknown |
| 720-482 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-484 | Englewood | Arapahoe | Landline | Unknown |
| 720-487 | Littleton | Jefferson | Landline | Unknown |
| 720-488 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-489 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-490 | Littleton | Jefferson | Cell Phone | Nextel Communications, Inc. |
| 720-493 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-494 | Longmont | Boulder | Landline | Qwest Corporation |
| 720-495 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-496 | Denver | Jefferson | Landline | Level 3 Communications, Llc... |
| 720-497 | Golden | Jefferson | Landline | Qwest Corporation |
| 720-506 | Aurora | Arapahoe | Landline | Level 3 Communications, Llc... |
| 720-514 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-519 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-521 | Denver | Denver | Landline | American Messaging (am), Inc. |
| 720-524 | Denver | Denver | Landline | Qwest Corporation |
| 720-528 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-529 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-530 | Denver | Denver | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-532 | Aurora | Arapahoe | Landline | Teleport Communications Gro... |
| 720-533 | Denver | Jefferson | Landline | Teleport Communications Gro... |
| 720-535 | Aurora | Arapahoe | Landline | Teleport Communications Gro... |
| 720-536 | Denver | Denver | Landline | Qwest Corporation |
| 720-540 | Denver | Adams | Landline | Qwest Corporation |
| 720-542 | Denver | Denver | Landline | Qwest Corporation |
| 720-544 | Denver | Jefferson | Landline | Qwest Corporation |
| 720-548 | Denver | Denver | Landline | Global Crossing Local Servi... |
| 720-554 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-558 | Broomfield | Jefferson | Landline | Qwest Corporation |
| 720-559 | Englewood | Arapahoe | Landline | Teleport Communications Gro... |
| 720-560 | Denver | Denver | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-562 | Boulder | Boulder | Landline | Qwest Corporation |
| 720-563 | Boulder | Boulder | Landline | Qwest Corporation |
| 720-564 | Boulder | Boulder | Landline | Qwest Corporation |
| 720-565 | Boulder | Boulder | Landline | Qwest Corporation |
| 720-566 | Broomfield | Broomfield | Landline | Qwest Corporation |
| 720-568 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-570 | Denver | Denver | Landline | Qwest Corporation |
| 720-578 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-579 | Aurora | Arapahoe | Landline | Allegiance Telecom Of Color... |
| 720-581 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-587 | Arvada | Jefferson | Landline | At&t Local |
| 720-596 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-620 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-621 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-622 | Boulder | Boulder | Landline | Qwest Corporation |
| 720-624 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-628 | Denver | Denver | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-629 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-635 | Denver | Denver | Cell Phone | New Cingular Wireless Pcs, Llc |
| 720-641 | Denver | Jefferson | Cell Phone | Nextel Communications, Inc. |
| 720-652 | Longmont | Boulder | Landline | Qwest Corporation |
| 720-657 | Henderson | Clark | Landline | Unknown |
| 720-666 | Greeley | Weld | Landline | Unknown |
| 720-670 | Englewood | Arapahoe | Cell Phone | Cellco Partnership Dba Veri... |
| 720-684 | Longmont | Boulder | Landline | Icg Telecom Group Co |
| 720-685 | Brighton | Adams | Landline | Qwest Corporation |
| 720-688 | Castle Rock | Douglas | Landline | Unknown |
| 720-690 | Littleton | Jefferson | Cell Phone | Leap Wireless Intl, Inc. Db... |
| 720-693 | Parker | Douglas | Landline | Unknown |
| 720-732 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-733 | Castle Rock | Douglas | Landline | Qwest Corporation |
| 720-744 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-746 | Golden | Jefferson | Landline | Qwest Corporation |
| 720-747 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-748 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-768 | Englewood | Arapahoe | Landline | Unknown |
| 720-771 | Boulder | Boulder | Cell Phone | Tmobile Usa, Inc. |
| 720-777 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-779 | Arvada | Jefferson | Landline | Unknown |
| 720-785 | Englewood | Arapahoe | Landline | Teleport Communications Gro... |
| 720-789 | Boulder | Boulder | Landline | Unknown |
| 720-810 | Denver | Denver | Cell Phone | Cellco Partnership Dba Veri... |
| 720-833 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-834 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-836 | Englewood | Arapahoe | Landline | Icg Telecom Group Co |
| 720-837 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-838 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-839 | Boulder | Boulder | Cell Phone | Sprint Spectrum L.p. |
| 720-840 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-841 | Boulder | Boulder | Cell Phone | Sprint Spectrum L.p. |
| 720-842 | Parker | Douglas | Landline | Qwest Corporation |
| 720-844 | Arvada | Jefferson | Landline | Unknown |
| 720-847 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-848 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-849 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-851 | Parker | Douglas | Landline | Qwest Corporation |
| 720-852 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-854 | Denver | Denver | Landline | Qwest Corporation |
| 720-855 | Denver | Denver | Landline | Qwest Corporation |
| 720-857 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-858 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-859 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-863 | Aurora | Arapahoe | Landline | Xo Colorado, Llc |
| 720-864 | Longmont | Boulder | Landline | Qwest Corporation |
| 720-865 | Arvada | Jefferson | Landline | Icg Telecom Group Co |
| 720-867 | Littleton | Arapahoe | Landline | Unknown |
| 720-870 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-872 | Denver | Adams | Landline | Qwest Corporation |
| 720-873 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-874 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-875 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-876 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-877 | Denver | Denver | Landline | Icg Telecom Group Co |
| 720-878 | Englewood | Arapahoe | Landline | Icg Telecom Group Co |
| 720-879 | Denver | Jefferson | Landline | Icg Telecom Group Co |
| 720-880 | Golden | Jefferson | Landline | Icg Telecom Group Co |
| 720-881 | Golden | Jefferson | Landline | Icg Telecom Group Co |
| 720-882 | Denver | Denver | Landline | Icg Telecom Group Co |
| 720-883 | Boulder | Boulder | Landline | Icg Telecom Group Co |
| 720-884 | Denver | Denver | Landline | Qwest Corporation |
| 720-886 | Aurora | Arapahoe | Landline | Qwest Corporation |
| 720-887 | Broomfield | Broomfield | Landline | Qwest Corporation |
| 720-888 | Broomfield | Jefferson | Landline | Level 3 Communications, Llc... |
| 720-889 | Denver | Denver | Landline | Allegiance Telecom Of Color... |
| 720-890 | Lafayette | Boulder | Landline | Qwest Corporation |
| 720-891 | Denver | Denver | Landline | Level 3 Communications, Llc... |
| 720-895 | Englewood | Arapahoe | Landline | Qwest Corporation |
| 720-897 | Denver | Denver | Landline | Global Crossing Local Servi... |
| 720-898 | Arvada | Jefferson | Landline | Qwest Corporation |
| 720-903 | Denver | Denver | Landline | Global Crossing Local Servi... |
| 720-904 | Denver | Denver | Landline | Qwest Corporation |
| 720-913 | Arvada | Jefferson | Landline | Icg Telecom Group Co |
| 720-917 | Denver | Denver | Landline | Qwest Corporation |
| 720-920 | Denver | Denver | Landline | Teleport Communications Gro... |
| 720-921 | Denver | Denver | Landline | Icg Telecom Group Co |
| 720-922 | Littleton | Jefferson | Landline | Qwest Corporation |
| 720-924 | Conifer | Jefferson | Landline | Qwest Corporation |
| 720-929 | Denver | Adams | Landline | Qwest Corporation |
| 720-931 | Arvada | Jefferson | Landline | Qwest Corporation |
| 720-932 | Denver | Denver | Landline | Qwest Corporation |
| 720-933 | Denver | Adams | Cell Phone | Tmobile Usa, Inc. |
| 720-934 | Littleton | Jefferson | Cell Phone | Tmobile Usa, Inc. |
| 720-935 | Littleton | Jefferson | Cell Phone | Tmobile Usa, Inc. |
| 720-936 | Littleton | Jefferson | Cell Phone | Tmobile Usa, Inc. |
| 720-937 | Littleton | Jefferson | Cell Phone | Tmobile Usa, Inc. |
| 720-938 | Boulder | Boulder | Cell Phone | Tmobile Usa, Inc. |
| 720-939 | Littleton | Jefferson | Cell Phone | Tmobile Usa, Inc. |
| 720-940 | Denver | Adams | Cell Phone | Sprint Spectrum L.p. |
| 720-941 | Denver | Denver | Landline | Qwest Corporation |
| 720-944 | Denver | Denver | Landline | Qwest Corporation |
| 720-945 | Denver | Denver | Landline | Qwest Corporation |
| 720-946 | Denver | Denver | Landline | Qwest Corporation |
| 720-947 | Denver | Denver | Landline | Qwest Corporation |
| 720-949 | Aurora | Arapahoe | Landline | At&t Local |
| 720-951 | Littleton | Jefferson | Cell Phone | Cellco Partnership Dba Veri... |
| 720-956 | Denver | Denver | Landline | Qwest Corporation |
| 720-961 | Arvada | Jefferson | Landline | Global Crossing Local Servi... |
| 720-962 | Denver | Jefferson | Landline | Qwest Corporation |
| 720-963 | Denver | Jefferson | Landline | Qwest Corporation |
| 720-971 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-972 | Denver | Adams | Landline | Qwest Corporation |
| 720-974 | Denver | Denver | Landline | Eschelon Telecom Of Colorad... |
| 720-975 | Aurora | Arapahoe | Landline | Eschelon Telecom Of Colorad... |
| 720-977 | Denver | Adams | Landline | Qwest Corporation |
| 720-979 | Broomfield | Broomfield | Cell Phone | Sprint Spectrum L.p. |
| 720-980 | Castle Rock | Douglas | Cell Phone | Sprint Spectrum L.p. |
| 720-981 | Littleton | Jefferson | Landline | Qwest Corporation |
| 720-982 | Denver | Denver | Cell Phone | Sprint Spectrum L.p. |
| 720-984 | Morrison | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-985 | Denver | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-987 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-988 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-989 | Littleton | Jefferson | Cell Phone | Sprint Spectrum L.p. |
| 720-998 | Aurora | Arapahoe | Landline | Comcast Phone Of Colorado,... |