There are 10 zip codes in Calhoun County, Iowa. The most populated is 50579, located in Rockwell City. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
505793,153Rockwell City
505632,468Manson
514492,020Lake City
50575649Pomeroy
50561592Lytton
50538562Farnhamville
51453537Lohrville
50586235Somers
5055275Knierim
5055145Jolley

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