There are 7 zip codes in Winneshiek County, Iowa. The most populated is 52101, located in Decorah. * 2024 populations estimated based on the latest ACS 5-year data.

CSV JSON
Zip Code
Population
City
5210112,962Decorah
521321,845Calmar
521611,396Ossian
521651,094Ridgeway
521441,031Fort Atkinson
52133627Castalia
52168350Spillville

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