There are 8 zip codes in O'Brien County, Iowa. The most populated is 51346, located in Hartley. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
513462,201Hartley
512481,712Sanborn
510461,432Paullina
512451,096Primghar
51022993Granville
51058982Sutherland
51231621Archer
51009166Calumet

Zip Codes in O'Brien County, Iowa by Population (2024)