| Business | Phone |
| Cain Hill Contracting Inc 9033 Red Branch Rd, Columbia 21045 | (410) 730-6550 |
| Chesapeake Contracting 8850 Columbia 100 Pkwy, Columbia 21045 | (410) 997-5105 |
| Engineered Framing Systems Inc 8950 State Route 108, Columbia 21045 | (410) 884-0888 |
| Motorola 7031 Columbia Gateway Dr, Columbia 21046 | (410) 712-6200 |
| P D Thomas Inc 5941 Millrace Ct, Columbia 21045 | (410) 312-0000 |