7 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 50140 | Lamoni | 2,817 |
| 50144 | Leon | 2,715 |
| 50065 | Davis City | 500 |
| 50108 | Grand River | 432 |
| 50103 | Garden Grove | 398 |
| 50067 | Decatur | 384 |
| 50262 | Van Wert | 225 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 7 ZCTAs in Decatur County, Iowa (US Census).