| Business | Phone |
| Bob Taylor Engineering Inc 69 Industrial Park Dr, Waldorf 20602 | (301) 893-9358 |
| Bolton Latham Llc 24 Industrial Park Dr # 1, Waldorf 20602 | (301) 638-7515 |
| Loiederman Associates Inc 401 Post Office Rd # 103, Waldorf 20602 | (301) 870-2166 |
| Lorenzi Dodds & Gunnill Arch 3475 Leonardtown Rd # 100, Waldorf 20601 | (301) 843-6255 |