| Business | Phone |
| American Tower Corp 11200 Cherokee St, Denver 80241 | (303) 450-1332 |
| Amdocs Telecommunications 1560 Broadway, Denver 80202 | (303) 991-1111 |
| Nine One One Inc 7000 Broadway # 300, Denver 80221 | (303) 426-1911 |
| Mas Tec 1400 W 122nd Ave, Denver 80234 | (303) 451-6633 |
| Broadband Solutions Inc 1127 Auraria Pkwy # 404, Denver 80204 | (303) 405-4030 |
| Callahan Associates Intl 3200 Cherry Crk South Dr # 650, Denver 80209 | (303) 715-3600 |
| Centurytel Government Rltns 1301 Pennsylvania St # 900, Denver 80203 | (303) 832-3239 |
| Covad Communications 9776 E Carolina Pl, Denver 80247 | (303) 337-6927 |
| Denver Fds 1500 Champa St, Denver 80202 | (303) 893-5590 |
| Dfc Telecom 2685 S Dayton Way, Denver 80231 | (303) 696-1852 |
| Ecs Evolving Consultative Svc Po Box 390545, Denver 80239 | (303) 371-4910 |
| Telaid 4700 S Syracuse St, Denver 80237 | (720) 488-4600 |
| Telecom Surplus Resources 4610 S Ulster St, Denver 80237 | (303) 221-4739 |
| Yellow Book Usa 4199 Oneida St # A, Denver 80216 | (303) 307-0099 |
| Unitec Hospitality Svc 122 S Sherman St, Denver 80209 | (303) 831-6400 |
| Kgp Telecommunications Inc 756 S Jason St, Denver 80223 | (303) 698-1025 |
| Level 3 Communications Inc 1670 Broadway, Denver 80202 | (303) 864-0759 |
| Level 3 Communications Inc 1850 Pearl St, Denver 80203 | (303) 326-7500 |
| Level 3 Communications Inc 633 17th St, Denver 80202 | (303) 292-2434 |
| Level 3 Communications Inc 717 17th St, Denver 80202 | (303) 292-2433 |
| Level 3 Communications Inc 950 17th St, Denver 80202 | (720) 904-3769 |
| Mci 707 17th St, Denver 80202 | (303) 390-1000 |
| Qwest Communications 1475 Lawrence St # 600, Denver 80202 | (303) 592-6200 |
| Qwest Communications 2626 W Evans Ave, Denver 80219 | (303) 778-4392 |
| Ria Telecom 2546 Federal Blvd, Denver 80211 | (720) 855-7191 |
| Telesys Communications 2825 S Eaton Way, Denver 80227 | (720) 962-0570 |