| Business | Phone |
| Aot Inc 103 Paul Mellon Ct, Waldorf 20602 | (301) 843-4045 |
| Applied Ordnance Technology 103 Paul Mellon Ct # A, Waldorf 20602 | (301) 705-7444 |
| Atcs 7 Post Office Rd # G, Waldorf 20602 | (301) 870-4530 |
| Human Factors Applications Inc 8 Jay Gould Ct, Waldorf 20602 | (301) 705-5044 |
| Summit Engineering Group 102 Paul Mellon Ct, Waldorf 20602 | (301) 870-0657 |