| Business | Phone |
| A T & T 2340 Dulles Corner Blvd, Herndon 20171 | (703) 713-7000 |
| A T & T Federal Systems 11820 Leesburg Pike, Herndon 20170 | (703) 404-5620 |
| Cavalier Business Sales Herndon 20170 | (703) 787-9554 |
| Cavalier Telephone 360 Herndon Pkwy, Herndon 20170 | (703) 464-9511 |
| China Telecom Usa Corp 607 Herndon Pkwy, Herndon 20170 | (703) 787-0088 |
| Globalone Comm Inc 13775 Mclearen Rd, Herndon 20171 | (703) 707-8197 |
| Kouso Communications 585 Grove St, Herndon 20170 | (703) 435-7300 |
| Nrtc 472 Elden St, Herndon 20170 | (703) 787-0874 |
| Nrtc National Rural Telecomm 2121 Cooperative Way # 500, Herndon 20171 | (703) 787-0874 |