There are 9 zip codes in Mahaska County, Iowa. The most populated is 52577, located in Oskaloosa. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5257714,437Oskaloosa
502072,313New Sharon
525611,054Fremont
52586619Rose Hill
50143546Leighton
52595539University Park
52534420Beacon
52543420Cedar
50027288Barnes City

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