| Zip Code | City | Population ↓ |
|---|---|---|
| 50501 | Fort Dodge | 28,823 |
| 50543 | Gowrie | 1,420 |
| 50530 | Dayton | 1,090 |
| 50532 | Duncombe | 804 |
| 50557 | Lehigh | 804 |
| 50523 | Callender | 682 |
| 50516 | Badger | 586 |
| 50544 | Harcourt | 565 |
| 50569 | Otho | 551 |
| 50524 | Clare | 439 |
| 50518 | Barnum | 365 |
| 50566 | Moorland | 325 |
| 50594 | Vincent | 288 |
| 50521 | Burnside | 45 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 14 ZCTAs in Webster County, Iowa (US Census).