| Business | Phone |
| Antietam Design Build 136 N Jonathan St, Hagerstown 21740 | (301) 739-2400 |
| Arro Consulting Inc 1101 Opal Ct # 3, Hagerstown 21740 | (301) 791-1100 |
| Associated Engineering Science 34 W Franklin St, Hagerstown 21740 | (301) 416-7105 |
| Henry Bonebrake & Assoc 10019 Pleasant View Dr, Hagerstown 21740 | (301) 582-3401 |
| International Afaq Ascert 376 Mill St, Hagerstown 21740 | (240) 313-9445 |
| L S Grim & Co 41 Summit Ave, Hagerstown 21740 | (301) 797-1702 |
| L S Grim Consulting Engineers 19922 Jefferson Blvd, Hagerstown 21742 | (301) 797-1702 |