100 Largest ZIP Codes in the United States by Population in Washington County, Iowa
Explore the 100 largest ZIP codes in the United States ranked by population using U.S. Census demographic data. This page lists ZIP codes located in Washington County, Iowa.
| Rank | ZIP Code | City | State | Population |
|---|---|---|---|---|
| 1 | 52353 | WASHINGTON | IA | 8,930 |
| 2 | 52247 | KALONA | IA | 5,222 |
| 3 | 52327 | RIVERSIDE | IA | 3,691 |
| 4 | 52356 | WELLMAN | IA | 2,577 |
| 5 | 52201 | AINSWORTH | IA | 1,508 |
| 6 | 52540 | BRIGHTON | IA | 1,230 |
| 7 | 52621 | CRAWFORDSVILLE | IA | 899 |
| 8 | 52359 | WEST CHESTER | IA | 422 |