Washington County, Kansas Zip Codes by Population (2024)

The most populated Zip Code in Washington County, Kansas is 66968, located in Washington. * 2024 populations estimated based on the latest ACS 5-year data.

Zip Code	City	Population
66968	Washington	1,309
66945	Hanover	1,048
66937	Clifton	928
66953	Linn	634
66943	Greenleaf	590
66944	Haddam	321
66933	Barnes	296
66958	Morrowville	272
66962	Palmer	218
66946	Hollenberg	120
66955	Mahaska	49