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.

CSV JSON
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)