There are 10 zip codes in Harrison County, Iowa. The most populated is 51555, located in Missouri Valley. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
515554,858Missouri Valley
515463,067Logan
515792,116Woodbine
515291,992Dunlap
51557834Mondamin
51563737Persia
51564479Pisgah
51556359Modale
51545271Little Sioux
51550137Magnolia

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