There are 10 zip codes in Clay County, Iowa. The most populated is 51301, located in Spencer. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5130112,326Spencer
51338933Everly
51357744Royal
51047690Peterson
51033460Linn Grove
51333394Dickens
51366303Webb
51343284Greenville
5134093Fostoria
5134139Gillett Grove

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