| Business | Phone |
| Indosoft International Inc 7253 Hanover Pkwy # C, Greenbelt 20770 | (301) 464-8941 |
| Mtg Greenbelt 20770 | (301) 982-7337 |
| Smith Solutions Inc 6301 Ivy Ln # 700, Greenbelt 20770 | (301) 220-2001 |
| Systems Engineering Applctn 6303 Ivy Ln, Greenbelt 20770 | (301) 474-7474 |
| T P Landis 6301 Ivy Ln # 700, Greenbelt 20770 | (301) 446-2866 |
| Teloc 6303 Ivy Ln, Greenbelt 20770 | (301) 474-9461 |
| Computer Systems Experts 6305 Ivy Ln, Greenbelt 20770 | (301) 474-1766 |
| Cray Federal Inc 7833 Walker Dr, Greenbelt 20770 | (301) 345-1030 |
| Z Microsystems Inc 7902 Kara Ct, Greenbelt 20770 | (301) 982-1901 |