| Business | Phone |
| A T & T Voice 7979 E Tufts Ave # 1400, Denver 80237 | (303) 265-8200 |
| Cbeyond Communications 4600 S Syracuse St # 650, Denver 80237 | (303) 468-1400 |
| All Call Free Denver 80211 | (303) 477-4752 |
| Allied Communication Llc 1930 Sherman St # 100, Denver 80203 | (303) 839-9200 |
| Gca Communications Co 4643 S Ulster St # 910, Denver 80237 | (303) 778-7709 |
| Metricom Inc 4600 S Syracuse St, Denver 80237 | (303) 256-6540 |
| Basset Telecom Voice Mail 629 E Colfax Ave, Denver 80203 | (303) 839-2180 |
| Qwest Communications 7900 E Union Ave, Denver 80237 | (720) 554-0432 |
| Cogent Communications 1670 Broadway # 490, Denver 80202 | (303) 831-0072 |
| Colorado Broadband Llc 7808 Cherry Crk South Dr # 102, Denver 80231 | (303) 745-4470 |
| Colorado Telecommunications 60 S Garfield St, Denver 80209 | (303) 795-8080 |
| Cypress Communications 1600 Broadway, Denver 80202 | (720) 921-7100 |
| Denver Telecom Professionals 1860 Lincoln St, Denver 80295 | (303) 380-0036 |
| Direct Effect 2171 S Trenton Way, Denver 80231 | (303) 468-4774 |
| Don's Complete Phone Svc 1224 Bannock St, Denver 80204 | (303) 623-6119 |
| Eschelon Telecom 1025 E 12th Ave, Denver 80218 | (303) 860-7902 |
| Winstar 910 15th St, Denver 80202 | (303) 221-3762 |
| X O Communications Inc 1660 Lincoln St # 2600, Denver 80264 | (303) 713-7100 |
| Toshiba Business Telephone 4705 Kingston St, Denver 80239 | (303) 373-2779 |
| Trinity Communications 2185 S Williams St, Denver 80210 | (303) 733-7888 |
| Kmc Telecom Solutions 910 15th St, Denver 80202 | (303) 573-0219 |
| Switch Room Designs 910 15th St # 1050, Denver 80202 | (303) 571-1773 |
| Tel America 1675 Broadway # 1280, Denver 80202 | (303) 634-5000 |
| Telephone Pioneers Of America 931 14th St, Denver 80202 | (303) 896-5386 |
| Skyline Ultd Inc 4700 Oakland St # 150, Denver 80239 | (303) 373-2330 |
| Live Wire Net 4577 Pecos St, Denver 80211 | (303) 458-5667 |
| M & C Communications 2412 W 32nd Ave, Denver 80211 | (303) 561-3499 |
| Rockynet.Com 1050 17th St # 240, Denver 80265 | (303) 623-2263 |
| Qwest Communications Intl Inc 1801 California St, Denver 80202 | (303) 992-1400 |
| Ricochet 1400 Glenarm Pl, Denver 80202 | (303) 572-1200 |
| Pasti Co Industries Inc 1011 W 45th Ave, Denver 80211 | (303) 561-2906 |