| Business | Phone |
| County Assessor 2300 Superior St, Webster City 50595 | (515) 832-9505 |
| Hamilton County Voter Rgstrtn 2300 Superior St, Webster City 50595 | (515) 832-9510 |
| Hamilton County Treasurer 2300 Superior St 7, Webster City 50595 | (515) 832-9540 |
| Treasurer-Tax Dept 2300 Superior St 7, Webster City 50595 | (515) 832-9542 |