| Business | Phone |
| Amsys Solutions Inc Ellicott City 21043 | (410) 480-0772 |
| Bhargava International Inc 8289 Main St # 204, Ellicott City 21043 | (410) 461-6320 |
| Ece Ltd 10176 Baltimore National Pike, Ellicott City 21042 | (410) 461-6451 |
| Gardner Engineering Inc 3233 Corporate Ct # A, Ellicott City 21042 | (410) 480-1500 |
| Geophysical Consultants 9729 Starling Rd, Ellicott City 21042 | (410) 313-8308 |
| H & M Engineering Inc 4521 Alpine Rose Bnd, Ellicott City 21042 | (410) 465-6970 |
| Indam Engineers Inc 3203 Corporate Ct # A, Ellicott City 21042 | (410) 461-0001 |
| Information Engineering Assoc Ellicott City 21042 | (410) 531-1563 |
| Nolan Associates Inc 4785 Dorsey Hall Dr # 124, Ellicott City 21042 | (410) 995-3651 |
| O & M Engineering Inc 10324 Baltimore National Pike, Ellicott City 21042 | (443) 325-0400 |
| Silver Associates 10820 State Route 108, Ellicott City 21042 | (301) 596-5660 |
| Wodell Technologies 5143 Bonnie Branch Rd, Ellicott City 21043 | (443) 520-3950 |