| Business | Phone |
| Optima Computer Systems 10112 Ellard Dr, Lanham 20706 | (301) 613-9015 |
| Bay State Computers Inc 4611 Assembly Dr # H, Lanham 20706 | (301) 306-0008 |
| Capitol Hill Software Inc 4325 Forbes Blvd # E, Lanham 20706 | (301) 459-2590 |
| Computer Sciences Corp 7700 Hubble Dr, Lanham 20706 | (301) 794-3586 |
| Harrison Communication Intl Lanham 20706 | (301) 577-4424 |