Clay County, Iowa ZIP Codes
- ZIP records
10 - Cities represented
10 - Sum of listed ZIP population estimates
16,420
Population sum includes positive estimates in these ZIP records; it is not an official county population.
Top ZIP Codes by Population
| Rank | ZIP Code | City | Population estimate |
|---|---|---|---|
| 1 | 51301 | Spencer | 12,638 |
| 2 | 51357 | Royal | 910 |
| 3 | 51338 | Everly | 852 |
| 4 | 51047 | Peterson | 693 |
| 5 | 51033 | Linn Grove | 421 |
| 6 | 51333 | Dickens | 374 |
| 7 | 51366 | Webb | 245 |
| 8 | 51343 | Greenville | 172 |
| 9 | 51340 | Fostoria | 75 |
| 10 | 51341 | Gillett Grove | 40 |
Cities in Clay County
ZIP Directory
Methodology: Records are grouped by the source file's listed county and state. Population sums add positive ZIP-level estimates and are not official county totals; city counts use distinct city labels in the source.