There are 7 zip codes in Winnebago County, Iowa. The most populated is 50436, located in Forest City. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
504365,879Forest City
504502,839Lake Mills
504241,532Buffalo Center
50478788Thompson
50453535Leland
50465187Rake
50473171Scarville

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