| Business | Phone |
| Ktd Inc 403 S 3rd St, Effingham 62401 | (217) 347-7736 |
| Mass Computer Systems Inc 306 S 4th St, Effingham 62401 | (217) 342-4976 |
| Patterson Technology Center 2202 Althoff Dr, Effingham 62401 | (217) 347-5964 |
| Profit Solutions Effingham 62401 | (217) 342-2500 |
| Technical Partners 813 N 3rd St, Effingham 62401 | (217) 342-4204 |