| Business | Phone |
| Calhoun County Bldg Inspector Park & County Rdamp;, Hardin 62047 | (618) 576-2733 |
| Calhoun County Circuit Clerk 101 N County Rd, Hardin 62047 | (618) 576-2451 |
| Calhoun County Road District Rr 1 Box 13b, Hardin 62047 | (618) 576-2600 |
| Calhoun County Supt-Assessment 2 County Rd, Hardin 62047 | (618) 576-8041 |