Washington County, KS ZIP codes
There are 11 ZIP codes in Washington County, KS, in 11 towns, from 66933 to 66968. The largest are 66968 (Washington), 66945 (Hanover) and 66937 (Clifton).
The county seat is Washington.
- ZIP codes
- 11
- Towns
- 11
- County seat
- Washington
- County FIPS
20201- State
- Kansas
- Population
- 5,533
- Median household income
- $65,482
- Land area
- 895 sq mi
Washington County ZIP codes by town
- Washington (county seat)
- 66968
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Washington County ZIP codes
The ZIP codes of Washington County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Washington County in numbers
About 5,533 people live in Washington County, in 2,373 households, the 62nd most populous of Kansas's 105 counties. The median household income is $65,482 a year, 12% below the Kansas median of $74,275 (US: $80,734). The median owner-occupied home is valued at $117,100 (46% below the Kansas median), and median gross rent is $562 a month. The median age is 43.4; 25.8% of adults 25 and over hold a bachelor's degree or higher (35.6% across Kansas); the average commute takes 20 minutes.
| Population | 5,533 |
|---|---|
| Households | 2,373 |
| Median age | 43.4 |
| Median household income | $65,482 |
| Median home value | $117,100 |
| Median gross rent | $562 |
| Bachelor's degree or higher | 25.8% |
| Mean commute | 20.3 min |
| Population density | 6 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Washington County
| Town | ZIP codes | Population |
|---|---|---|
| Washington | 1 | 1,155 |
| Hanover | 1 | 828 |
| Linn | 1 | 470 |
| Clifton | 1 | 442 |
| Greenleaf | 1 | 320 |
| Barnes | 1 | 177 |
| Palmer | 1 | 149 |
| Haddam | 1 | 118 |
| Morrowville | 1 | 96 |
| Mahaska | 1 | 47 |
| Hollenberg | 1 | 9 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Washington County.
- Riley County (9)
- Marshall County (11)
- Cloud County (6)
- Clay County (5)
- Thayer County, NE (11)
- Republic County (9)
Not sure you are in Washington County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Washington County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
66933 | Barnes , KS | Standard | 345 | $55,625 | $85,600 |
66937 | Clifton , KS | Standard | 691 | $63,456 | $100,000 |
66943 | Greenleaf , KS | Standard | 568 | $67,738 | $117,300 |
66944 | Haddam , KS | Standard | 304 | $75,625 | — |
66945 | Hanover , KS | Standard | 1,063 | $69,688 | $118,000 |
66946 | Hollenberg , KS | Standard | 161 | $53,542 | $121,700 |
66953 | Linn , KS | Standard | 628 | $66,250 | $109,200 |
66955 | Mahaska , KS | Standard | 47 | $85,500 | — |
66958 | Morrowville , KS | Standard | 198 | $77,750 | $75,000 |
66962 | Palmer , KS | Standard | 302 | $74,583 | $303,700 |
66968 | Washington , KS | Standard | 1,454 | $59,438 | $124,900 |
Cite this page
zipcodes.pro. “Washington County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ks/county/washington
Underlying data is public domain or openly licensed — sources, vintages and licences.