County · Wisconsin · United States
Jefferson County ZIP codes
10 ZIP codes · 10 cities · FIPS 55055
Key facts
- State
- Wisconsin (WI)
- FIPS code
- 55055
- Population
- 85,867
- Median household income
- $80,604
- Median age
- 41.3
- Land area
- 556.5 sq mi (1,441.3 km²)
- Population density
- 154 / sq mi
- Area codes
- 262, 274, 920
Cities and ZIP codes in Jefferson County (10)
| City | ZIP codes |
|---|---|
| Fort Atkinson | 53538 |
| Helenville | 53137 |
| Ixonia | 53036 |
| Jefferson | 53549 |
| Johnson Creek | 53038 |
| Lake Mills | 53551 |
| Palmyra | 53156 |
| Sullivan | 53178 |
| Waterloo | 53594 |
| Watertown | 53094 |
About this page
County figures are Census county-level values (ACS 5-year); the ZIP list shows the ZIPs whose primary county this is — a ZIP on a border can also serve neighbouring counties.
Sources: U.S. Census Bureau (2020 county relationship file, ACS 5-year) · GeoNames. Methodology.