8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 51246 | Rock Rapids | 4,041 |
| 51241 | Larchwood | 2,103 |
| 51240 | Inwood | 1,914 |
| 51237 | George | 1,605 |
| 51235 | Doon | 1,007 |
| 51243 | Little Rock | 735 |
| 51230 | Alvord | 478 |
| 51242 | Lester | 379 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Lyon County, Iowa (US Census).