| Business | Phone |
| American Association For Lab 5301 Buckeystown Pike # 350, Frederick 21704 | (301) 644-3248 |
| Cbl Path Inc 85 Thomas Johnson Dr, Frederick 21702 | (301) 668-9611 |
| Environmental Systems Svc 810 E South St, Frederick 21701 | (301) 695-9166 |
| Southern Research Institute 365 W Patrick St, Frederick 21701 | (301) 668-6141 |
| Southern Research Institute 431 Aviation Way, Frederick 21701 | (301) 694-3232 |