| ZIP Code | ZIP Code Place Name | County | ZIP Code Type |
|---|---|---|---|
| 50515 | Ayrshire | Palo Alto County | Standard |
| 50585 | Sioux Rapids | Clay County | Standard |
| 51033 | Linn Grove | Buena Vista County | Standard |
| 51047 | Peterson | Clay County | Standard |
| 51058 | Sutherland | Obrien County | Standard |
| 51301 | Spencer | Clay County | Standard |
| 51333 | Dickens | Clay County | Standard |
| 51338 | Everly | Clay County | Standard |
| 51340 | Fostoria | Clay County | PO Box |
| 51341 | Gillett Grove | Clay County | PO Box |
| 51343 | Greenville | Clay County | Standard |
| 51346 | Hartley | Obrien County | Standard |
| 51357 | Royal | Clay County | Standard |
| 51358 | Ruthven | Palo Alto County | Standard |
| 51364 | Terril | Dickinson County | Standard |
| 51366 | Webb | Clay County | Standard |