| Zip Code | City | Population ↓ |
|---|---|---|
| 50126 | Iowa Falls | 6,402 |
| 50627 | Eldora | 3,263 |
| 50006 | Alden | 1,586 |
| 50122 | Hubbard | 1,511 |
| 50230 | Radcliffe | 916 |
| 50258 | Union | 831 |
| 50206 | New Providence | 500 |
| 50672 | Steamboat Rock | 420 |
| 50269 | Whitten | 133 |
| 50102 | Garden City | 127 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 10 ZCTAs in Hardin County, Iowa (US Census).