| Business | Phone |
| Comus Restaurant Systems 2502 Urbana Pike, Ijamsville 21754 | (301) 874-2900 |
| Mtbw Svc Inc 10097 Tyler Pl # 8, Ijamsville 21754 | (301) 831-1005 |
| Sensible Software Inc 9639 Doctor Perry Rd # 123, Ijamsville 21754 | (301) 831-8630 |
| Brian Shirey Ijamsville 21754 | (301) 798-0577 |