| Business | Phone |
| Affiliated Engineers Inc 13007 Prairie View Pl, Germantown 20874 | (301) 924-0033 |
| Applied Creative Technologies 13227 Executive Park Ter, Germantown 20874 | (301) 686-0636 |
| Applied Micro Design 19516 Amaranth Dr, Germantown 20874 | (301) 540-9506 |
| Tricad Engineering 20010 Century Blvd, Germantown 20874 | (301) 540-1842 |
| Urs Corp 12850 Middlebrook Rd # 304, Germantown 20874 | (301) 353-0031 |
| Tech Source 20251 Century Blvd # 440, Germantown 20874 | (301) 515-1344 |
| Tetra Tech Nus Inc 20251 Century Blvd, Germantown 20874 | (301) 528-5552 |
| Brown & Root Svc 20251 Century Blvd # 410, Germantown 20874 | (240) 686-3444 |
| Phillips Technical Svc 20424 Greenfield Rd, Germantown 20876 | (301) 428-9607 |
| Engineering Management Concept Germantown 20876 | (301) 916-9102 |
| Neal Research Assoc 11809 Collins Dr, Germantown 20876 | (301) 428-9066 |
| Greenhorne & O'Mara Inc 20410 Century Blvd # 200, Germantown 20874 | (301) 444-8282 |
| Link Technologies 20030 Century Blvd # 210, Germantown 20874 | (301) 515-9654 |