| Business | Phone |
| Energy & Engineering Solutions 9449 Penfield Ct, Columbia 21045 | (410) 964-3513 |
| Hadron Inc 10480 Little Patuxent Pkwy, Columbia 21044 | (410) 740-5160 |
| Ilex Engineering Inc 9250 Bendix Rd, Columbia 21045 | (410) 715-1117 |
| K M Atlantic Columbia 21046 | (410) 381-2770 |
| Lmit 9017 Mendenhall Ct # F, Columbia 21045 | (410) 312-7253 |
| Lockheed Martin Corp 9020 Mendenhall Ct # J, Columbia 21045 | (410) 309-9720 |
| Rjm Engineering Inc 7135 Minstrel Way, Columbia 21045 | (410) 312-9119 |
| Rommel Engineering Inc 6655 Dobbin Rd, Columbia 21045 | (410) 290-9025 |
| Stanton Engineering Svc 10280 Old Columbia Rd # 275, Columbia 21046 | (410) 290-9301 |
| Stellar Communications & Eng 6589 Quiet Hours # T3, Columbia 21045 | (410) 290-6951 |