There are 8 zip codes in Washington County, Iowa. The most populated is 52353, located in Washington. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
523538,930Washington
522475,222Kalona
523273,691Riverside
523562,577Wellman
522011,508Ainsworth
525401,230Brighton
52621899Crawfordsville
52359422West Chester
showing: 8 rows

Zip Codes in Washington County, Iowa by Population (2024)