| Business | Phone |
| Afton Twp Office 16294 Crego Rd, Dekalb 60115 | (815) 756-9427 |
| Finance Office 200 S 4th St, Dekalb 60115 | (815) 748-2000 |
| De Kalb City Water Refuse 200 S 4th St, Dekalb 60115 | (815) 748-2085 |
| De Kalb Building & Community 223 S 4th St A, Dekalb 60115 | (815) 748-2070 |
| De Kalb Engineering 223 S 4th St B, Dekalb 60115 | (815) 748-2030 |
| De Kalb Finance 200 S 4th St, Dekalb 60115 | (815) 748-2080 |
| De Kalb Parking Enforcement 200 S 4th St, Dekalb 60115 | (815) 748-2300 |
| De Kalb Personnel 200 S 4th St, Dekalb 60115 | (815) 748-2094 |
| De Kalb Street Div 1316 Market St, Dekalb 60115 | (815) 748-2040 |
| De Kalb Township Supervisor 2323 S 4th St, Dekalb 60115 | (815) 758-8282 |