There are 5 zip codes in Osceola County, Iowa. The most populated is 51249, located in Sibley. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
512493,388Sibley
513541,090Ocheyedan
51232774Ashton
51350443Melvin
51345418Harris
showing: 5 rows

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