| Business | Phone |
| Total System Design 11 N 32nd St, Belleville 62226 | (618) 235-7172 |
| Bric Partnership Llc 100 E Washington St 220, Belleville 62220 | (618) 277-5200 |
| Camber Corp 720 W Main St, Belleville 62220 | (618) 234-3400 |
| Ddk Scientific Corp 1 11th Fairway Ct, Belleville 62220 | (618) 235-2849 |
| Elkott Engineering Inc 110 W Main St, Belleville 62220 | (618) 277-1019 |
| Heideman & Assoc 2622 West Blvd, Belleville 62221 | (618) 233-0065 |
| Kuhlmann Design Group Inc 15 E Washington St, Belleville 62220 | (618) 234-8898 |