| Business | Phone |
| Advanced Data Systems Inc 16417 Tomahawk Dr, Gaithersburg 20878 | (301) 977-3556 |
| Wisor Telecommunications 300 Professional Dr # 200, Gaithersburg 20879 | (301) 417-9401 |
| Bandwidth Inc 10833 Royal Bonnett Cir, Gaithersburg 20886 | (301) 519-0240 |
| Tellabs Inc 904 Wind River Ln # 101, Gaithersburg 20878 | (301) 963-9540 |
| Campbell Associates 12551 Carrington Hill Dr, Gaithersburg 20878 | (301) 975-0050 |
| Edge Communications 19225 Orbit Dr, Gaithersburg 20879 | (301) 527-1600 |
| Global Satcom Technology Inc 9141 Arbuckle Dr, Gaithersburg 20877 | (301) 963-0088 |