| Business | Phone |
| Affiliated Engineers Inc 701 Devonshire Dr, Champaign 61820 | (217) 363-3894 |
| Applied Pavement Technology 3001 Research Rd C, Champaign 61822 | (217) 398-3977 |
| Geocon Engineering Inc 306 Tiffany Ct B, Champaign 61822 | (217) 403-9990 |
| Frauenhoffer & Assoc 3002 Crossing Ct, Champaign 61822 | (217) 351-6268 |
| Farnsworth Group 1819 S Neil St F, Champaign 61820 | (217) 352-7408 |
| Donohue & Assoc Inc 115 N Neil St 213, Champaign 61820 | (217) 352-9990 |
| Clark Dietz Inc 1817 S Neil St 100, Champaign 61820 | (217) 373-8900 |