There are 11 zip codes in Plymouth County, Iowa. The most populated is 51031, located in Le Mars. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
5103112,595Le Mars
511085,555Sioux City
511093,619Sioux City
510503,043Remsen
510012,370Akron
510242,125Hinton
510282,027Kingsley
510381,763Merrill
51062356Westfield
51008168Brunsville
51045113Oyens

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