| Business | Phone |
| Aiello Inc 5313 Columbia Rd, Columbia 21044 | (410) 730-2200 |
| Avtek Associates Inc 10632 Little Patuxent Pkwy, Columbia 21044 | (410) 381-4600 |
| Chesapeake Tech Inc 7262 Cradlerock Way, Columbia 21045 | (410) 290-8190 |
| Cutting Edge Scientific Group 5925 Iron Frame Way, Columbia 21044 | (301) 596-1840 |
| Delta Iii Assoc Inc 5397 Twin Knolls Rd, Columbia 21045 | (410) 730-4700 |
| Everstar Us 9520 Gerwig Ln, Columbia 21046 | (410) 540-9830 |
| J H Electronic Sales Inc 9150 Rumsey Rd, Columbia 21045 | (301) 596-0444 |
| Lienau Associates Inc 9693 Gerwig Ln, Columbia 21046 | (410) 290-8320 |
| Mechtronics 10015 Old Columbia Rd # B, Columbia 21046 | (410) 309-7064 |
| Robert O Barnard Assoc Inc 9017 Red Branch Rd # F, Columbia 21045 | (410) 720-0900 |
| Skaist Associates 6251 Plaited Reed, Columbia 21044 | (410) 997-9540 |
| Southern Sales Co 10621 Gramercy Pl, Columbia 21044 | (410) 715-1711 |
| Tyler Griffin Co Columbia 21045 | (410) 995-1215 |
| Wichitech Industries Inc 8980 State Route 108 # E, Columbia 21045 | (410) 715-1076 |