There are 8 zip codes in Lyon County, Iowa. The most populated is 51246, located in Rock Rapids. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
512464,007Rock Rapids
512412,237Larchwood
512371,700George
512401,629Inwood
512351,012Doon
51243663Little Rock
51230578Alvord
51242343Lester
showing: 8 rows

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