9 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50595 | Webster City | 8,768 |
| 50130 | Jewell | 1,517 |
| 50249 | Stratford | 1,256 |
| 50075 | Ellsworth | 805 |
| 50246 | Stanhope | 711 |
| 50271 | Williams | 594 |
| 50132 | Kamrar | 404 |
| 50034 | Blairsburg | 397 |
| 50231 | Randall | 160 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 9 ZCTAs in Hamilton County, Iowa (US Census).