| Business | Phone |
| Campbell & Paris Engineers 4215 Lafayette Center Dr 2, Chantilly 20151 | (703) 802-0093 |
| Geo Designs & Engineering 14221a Willard Rd, Chantilly 20151 | (703) 961-8130 |
| Millennium Science & Engnrng 14150 Newbrook Dr 120, Chantilly 20151 | (703) 734-1090 |
| Pluribus International Corp 4501 Singer Ct, Chantilly 20151 | (703) 817-0680 |
| Paragon Systems Inc 14160 Newbrook Dr 150, Chantilly 20151 | (703) 263-7176 |