| Business | Phone |
| Astron Corp 22560 Glenn Dr 114, Sterling 20164 | (703) 450-5517 |
| Coulter Associates Inc 45915 Maries Rd 140, Sterling 20166 | (703) 444-0511 |
| Quintron Corp Dulles Intl Medical Bldg, Sterling 20164 | (703) 450-6636 |
| Meda Inc 43676 Trade Center Pl 145, Sterling 20166 | (703) 471-1445 |