| Business | Phone |
| Americom Telephone Systems Inc 470 Springpark Pl, Herndon 20170 | (703) 471-6083 |
| Symantec Corp 2350 Corporate Park Dr, Herndon 20171 | (703) 885-1700 |
| Inter Lan Communications Inc 205 Van Buren St 420, Herndon 20170 | (703) 904-7090 |
| Lam Associates Inc 3210 Upper Wynnewood Pl, Herndon 20171 | (703) 620-3278 |