| Business | Phone |
| Aat Communications System 4805 Bel Pre Rd, Rockville 20853 | (301) 460-8500 |
| Airtime Communications 11520 Rockville Pike, Rockville 20852 | (301) 984-6050 |
| Vicom Communications Inc 6219 Executive Blvd, Rockville 20852 | (301) 230-8992 |
| Vision Communications Llc 5884 Hubbard Dr, Rockville 20852 | (301) 984-0303 |
| Sunrise World Communications 6011 Executive Blvd, Rockville 20852 | (301) 816-3011 |
| Caplan Communications 12530 Parklawn Dr, Rockville 20852 | (301) 770-0550 |
| Dermott Communications 14 Cedarwood Ct, Rockville 20852 | (301) 468-2468 |
| East West Communications 1682 E Gude Dr, Rockville 20850 | (301) 251-0716 |
| Nhc Communications 15200 Shady Grove Rd, Rockville 20850 | (301) 670-2818 |
| Mdu Communications 5535 Wilkins Ct, Rockville 20852 | (301) 770-1241 |
| Ignite Communications Corp 9707 Medical Center Dr, Rockville 20850 | (240) 268-0591 |
| Kleinmann Communication Group 12600 Saint James Rd, Rockville 20850 | (301) 294-9584 |
| Ixc Communications 4007 Norbeck Rd, Rockville 20853 | (301) 929-9799 |
| Kennan Communication 12305 Riding Fields Rd, Rockville 20850 | (301) 519-8001 |
| Khera Communications 5 Choke Cherry Rd, Rockville 20850 | (301) 869-4449 |