Washington County, Iowa ZIP Codes
- ZIP records
7 - Cities represented
7 - Sum of listed ZIP population estimates
19,436
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 | 52353 | Washington | 9,241 |
| 2 | 52327 | Riverside | 3,796 |
| 3 | 52356 | Wellman | 2,664 |
| 4 | 52248 | Keota | 1,675 |
| 5 | 52201 | Ainsworth | 1,148 |
| 6 | 52621 | Crawfordsville | 604 |
| 7 | 52359 | West Chester | 308 |
Cities in Washington 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.