| Business | Phone |
| Aamco Transmissions 2455 Old Washington Rd, Waldorf 20601 | (301) 645-6055 |
| Anm Transmissions & Elec Svc 11702 Bad Dog Aly, Waldorf 20601 | (301) 638-0337 |
| Atm Transmission Center Route 925, Waldorf 20601 | (301) 932-9220 |
| Cottman Transmission Ctr 11780 Holly Auto Center Ln, Waldorf 20601 | (301) 645-4055 |
| Holly Transmission System 11780 Holly Auto Center Ln, Waldorf 20601 | (301) 645-2223 |
| International Transmission Svc 12391 Waldorf Business Sq, Waldorf 20601 | (301) 705-5505 |
| John's Automotive & Trans 12337 Washington Sq, Waldorf 20601 | (301) 870-4566 |
| St Charles Transmission Inc 28 Industrial Park Dr # H, Waldorf 20602 | (301) 645-6645 |