| Business | Phone |
| Clerk Office 1202 Broadway, Denison 51442 | (712) 263-2242 |
| Court Attendant 1202 Broadway, Denison 51442 | (712) 263-3249 |
| Iowa Dot Area Maintenance 2435 Airport St, Denison 51442 | (712) 263-3347 |
| Judges Chambers 12th St & Broadwayamp;, Denison 51442 | (712) 263-2805 |
| Magistrate Court 1202 Broadway, Denison 51442 | (712) 263-4519 |
| Magistrate Office 1202 Broadway, Denison 51442 | (712) 263-6002 |
| Narcotics Enforcement Div 3710 Highway 30, Denison 51442 | (712) 263-8530 |