Washington County, Kansas ZIP Codes

11 ZIP Codes

Zip Code
City
Population ↓
66968Washington1,454
66945Hanover1,063
66937Clifton691
66953Linn628
66943Greenleaf568
66933Barnes345
66944Haddam304
66962Palmer302
66958Morrowville198
66946Hollenberg161
66955Mahaska47

Overview of ZIP Codes in Washington County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
11
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 11 ZCTAs in Washington County, Kansas (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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