8 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 51246 | Rock Rapids | 4,075 |
| 51241 | Larchwood | 2,052 |
| 51240 | Inwood | 1,842 |
| 51237 | George | 1,577 |
| 51235 | Doon | 1,152 |
| 51243 | Little Rock | 702 |
| 51230 | Alvord | 517 |
| 51242 | Lester | 346 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 8 ZCTAs in Lyon County, Iowa (US Census).