| Business | Phone |
| Adpnhc 7125 Riverwood Dr, Columbia 21046 | (410) 381-5647 |
| Ceridian Employer Svc 8989 Herrmann Dr # 100, Columbia 21045 | (410) 381-8000 |
| Keane Federal Systems Inc 9710 Patuxent Woods Dr, Columbia 21046 | (410) 995-6127 |
| L-3 Communications 9891 Brokenland Pkwy # 200, Columbia 21046 | (410) 720-5155 |
| Metavante Corp 10630 Little Patuxent Pkwy, Columbia 21044 | (410) 772-3800 |