There are 4 zip codes in Harper County, Oklahoma. The most populated is 73834, located in Buffalo. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
738341,636Buffalo
738481,592Laverne
73851150May
73855147Rosston
showing: 4 rows

Zip Codes in Harper County, Oklahoma by Population (2024)