7 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50140 | Lamoni | 2,842 |
| 50144 | Leon | 2,692 |
| 50065 | Davis City | 517 |
| 50103 | Garden Grove | 453 |
| 50108 | Grand River | 376 |
| 50067 | Decatur | 354 |
| 50262 | Van Wert | 263 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Decatur County, Iowa (US Census).