There are 9 zip codes in Cerro Gordo County, Iowa. The most populated is 50401, located in Mason City. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5040128,909Mason City
504289,119Clear Lake
504691,647Rockwell
50479736Thornton
50482692Ventura
50464512Plymouth
50477215Swaledale
50433181Dougherty
50467103Rock Falls

Zip Codes in Cerro Gordo County, Iowa by Population (2024)