There are 8 zip codes in Cass County, Iowa. The most populated is 50022, located in Atlantic. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
500228,664Atlantic
515351,730Griswold
500201,281Anita
51544741Lewis
50853693Massena
50843487Cumberland
51552204Marne
50274132Wiota

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