| Business | Phone |
| Barnes & Johnson Inc 8503 Euclid Ave 1, Manassas 20111 | (703) 330-8300 |
| Bowman Consulting Group Ltd 9813 Godwin Dr, Manassas 20110 | (703) 530-8093 |
| Christopher Consultants Ltd 7215 Gateway Ct, Manassas 20109 | (703) 393-9887 |
| Ross France & Ratliff Ltd 8802 Sudley Rd, Manassas 20110 | (703) 361-4188 |
| Rinker Design Assoc Pc 9300 W Courthouse Rd 300, Manassas 20110 | (703) 368-7373 |
| Phil Lindgren & Assoc 8711 Plantation Ln, Manassas 20110 | (703) 330-5666 |
| Frederick & Ward Assoc Inc 7900 Sudley Rd, Manassas 20109 | (703) 361-7718 |
| Mc Gettigan & Dalton 9028 Prince William St, Manassas 20110 | (703) 369-6761 |
| Land Design Consultants Inc 8569 Sudley Rd E, Manassas 20110 | (703) 368-0603 |