| Business | Phone |
| Dalcolm Engineering & Tech Svc 21 N Philadelphia Blvd, Aberdeen 21001 | (410) 272-9020 |
| Engineering Consulting Svc 1202 Technology Dr # D, Aberdeen 21001 | (410) 297-8108 |
| Mission Critical Enterprises 33 N Philadelphia Blvd, Aberdeen 21001 | (443) 512-0878 |