| County Switchboard | 563-243-6210 or 1-866-227-9040 |
| Auditor | 563-244-0568 |
| Board of Health | 563-659-8148 |
| Board of Supervisors | 563-244-0575 |
| Case Management | 563-244-0562 |
| City Assessor | 563-244-0571 |
| Clerk of District Court | 563-243-6213 |
| Clinton/Jackson Early Childhood/Decat | 563-659-3651 |
| Communications | 563-242-9211 |
| Community Assistance | 563-244-0576 |
| Conservation | 563-847-7202 |
| County Assessor | 563-244-0569 |
| County Attorney | 563-243-6218 |
| County Jail | 563-242-9211 |
| County Justice Coordinator | 563-243-6210 |
| District & Juvenile Court | 563-243-6210 |
| District Court & Administration | 563-243-6213 |
| Emergencey Management | 563-242-5712 |
| Environmental Services | 563-659-8148 |
| Mental Health | 563-244-0563 |
| Planning & Zoning | 563-659-8149 |
| Recorder | 563-244-0565 |
| Secondary Roads/Engineer - Clinton | 563-244-0564 |
| Secondary Roads/Engineer - DeWitt | 563-659-1404 |
| Sheriff's Office | 563-242-9211 |
| Treasurer | 563-244-0573 |
| Veteran Affairs - Clinton | 563-242-1151 |
| Veteran Affairs - DeWitt | 563-659-6230 |