ZIP CodesZIP codes in Washington County, Kansas
Washington County, Kansas has 11 ZIP codes in this list, from 66933 to 66968. They cover 11 places, among them Barnes, Clifton, Greenleaf and Haddam.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 66933 | Barnes | 86.1 | 39.684, -96.868 |
| 66937 | Clifton | 139 | 39.620, -97.261 |
| 66943 | Greenleaf | 92.7 | 39.706, -96.978 |
| 66944 | Haddam | 93.2 | 39.852, -97.308 |
| 66945 | Hanover | 101 | 39.893, -96.869 |
| 66946 | Hollenberg | 51.3 | 39.960, -96.974 |
| 66953 | Linn | 70.2 | 39.685, -97.085 |
| 66955 | Mahaska | 53.1 | 39.984, -97.345 |
| 66958 | Morrowville | 77.0 | 39.862, -97.183 |
| 66962 | Palmer | 54.7 | 39.619, -97.112 |
| 66968 | Washington | 133 | 39.822, -97.048 |
The ZIP code areas of Washington County add up to about 951 square miles of land (2,464 sq km) as the Census Bureau draws them. The largest is 66937 (Clifton), with 139 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Barnes, KS 66933.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.