There are 11 zip codes in Washington County, Kansas. The most populated is 66968, located in Washington. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
669681,309Washington
669451,048Hanover
66937928Clifton
66953634Linn
66943590Greenleaf
66944321Haddam
66933296Barnes
66958272Morrowville
66962218Palmer
66946120Hollenberg
6695549Mahaska

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