| Business | Phone |
| Brudis & Assoc Inc 9220 Rumsey Rd # 110, Columbia 21045 | (410) 884-3607 |
| Daniel Consultants Inc 8950 State Route 108 # 229, Columbia 21045 | (410) 995-0090 |
| Engineering & Technical Svc 9151 Rumsey Rd # 160, Columbia 21045 | (410) 740-2233 |
| Engineering Technologies Assoc 9115 Guilford Rd # 100, Columbia 21046 | (410) 461-9920 |
| Frederick Ward Assoc Inc 7125 Riverwood Dr, Columbia 21046 | (410) 720-6900 |
| Lde Inc 9250 Rumsey Rd # 106, Columbia 21045 | (301) 596-3424 |
| Versar Inc 9200 Rumsey Rd # 100, Columbia 21045 | (410) 964-9200 |