There are 6 zip codes in Washington County, Oklahoma. The most populated is 74006, located in Bartlesville. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
7400627,280Bartlesville
740294,940Dewey
740612,455Ramona
740512,020Ochelata
740221,803Copan
74082321Vera

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