| Business | Phone |
| Alion Science & Technology 2 Eagle Ctr, O Fallon 62269 | (618) 628-1920 |
| Sba Computers Inc 620 E State St, O Fallon 62269 | (618) 628-9590 |
| Secure Data Inc 311 S Lincoln Ave, O Fallon 62269 | (618) 628-9566 |
| Digital Home O Fallon 62269 | (618) 624-8603 |
| Digitalnet 1400 S Lincoln Ave, O Fallon 62269 | (618) 624-2777 |
| Houston Associates Inc 8 Eagle Ctr, O Fallon 62269 | (618) 632-9300 |