| Business | Phone |
| Warren I Lichtenberg 3204 Tower Oaks Blvd # 300, Rockville 20852 | (301) 230-1470 |
| Bae Systems North America 1601 Research Blvd, Rockville 20850 | (301) 838-6000 |
| Beltway Cable Tv Svc 15815 Paramount Dr, Rockville 20855 | (301) 921-4047 |
| Southwest Research Institute 12300 Twinbrook Pkwy, Rockville 20852 | (301) 881-0226 |
| Doyle 15837 Crabbs Branch Way, Rockville 20855 | (301) 979-0013 |
| Medical Plaza Two 9711 Medical Center Dr # 120, Rockville 20850 | (301) 340-6535 |
| Lockwood Greene Engineers Inc 9800 Medical Center Dr, Rockville 20850 | (240) 793-3025 |
| J S Lee Assoc Inc 451 Hungerford Dr # 105, Rockville 20850 | (301) 299-2380 |