| Business | Phone |
| Tri-Cor Industries Inc 5 Eagle Ctr 8, O Fallon 62269 | (618) 632-9804 |
| Bmc Software Inc 2082 Quarry Rd, O Fallon 62269 | (618) 632-5898 |
| Cdo Technologies 1722 Corporate Xing, O Fallon 62269 | (618) 628-9549 |
| Computer Sciences Corp 1716 Corporate Xing, O Fallon 62269 | (618) 628-4208 |
| Data Train Po Box 632, O Fallon 62269 | (618) 632-1144 |
| Eds Corp 1 Eagle Ctr 1, O Fallon 62269 | (618) 624-5186 |
| Labantage Solutions 1400 S Lincoln Ave, O Fallon 62269 | (618) 622-9379 |