| Business | Phone |
| Stockton Inc 7940 Cessna Ave, Gaithersburg 20879 | (301) 527-1550 |
| Datamax Solutions Inc 12 Meem Ave, Gaithersburg 20877 | (301) 948-4446 |
| Directech Inc 8595 Grovemont Cir, Gaithersburg 20877 | (301) 417-2934 |
| Paratech 10229 Ridgeline Dr, Gaithersburg 20886 | (301) 258-5006 |
| Persys Inc 951 Russell Ave # A, Gaithersburg 20879 | (301) 987-9740 |
| Ocr Svc Inc 19209 Chennault Way, Gaithersburg 20879 | (301) 670-0350 |
| Global Exchange Svc Inc 100 Edison Park Dr, Gaithersburg 20878 | (301) 340-4000 |
| Kennebec Systems Po Box 368, Gaithersburg 20884 | (301) 340-0779 |