Jefferson County, Wisconsin ZIP codes
10 ZIP codes are in Jefferson County, plus 9 that cross in from neighboring counties. It's part of the Watertown-Fort Atkinson, WI micro area.
- ZIP codes
- 10
- Population in these ZIPs
- 76,915
- Avg. median income
- $84,700population-weighted
- Cities & towns
- 10
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Jefferson County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 53036 | Ixonia | 3,730 | $92,674 | $479,100 |
| 53038 | Johnson Creek | 4,192 | $96,127 | $417,600 |
| 53094 | Watertown | 17,998 | $73,443 | $322,300 |
| 53137 | Helenville | 1,650 | $116,550 | $465,700 |
| 53156 | Palmyra | 3,232 | $85,313 | $375,200 |
| 53178 | Sullivan | 2,497 | $99,875 | $435,300 |
| 53538 | Fort Atkinson | 18,813 | $82,783 | $329,500 |
| 53549 | Jefferson | 9,873 | $80,101 | $346,500 |
| 53551 | Lake Mills | 9,731 | $94,401 | $429,300 |
| 53594 | Waterloo | 5,199 | $88,390 | $360,300 |
ZIP codes partly in Jefferson County
These ZIP codes are mostly in a neighboring county but cover part of Jefferson County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 53066 | Oconomowoc | Waukesha County | 37,558 | $113,114 | $582,500 |
| 53098 | Watertown | Dodge County | 11,353 | $74,431 | $335,200 |
| 53118 | Dousman | Waukesha County | 7,554 | $108,772 | $614,800 |
| 53119 | Eagle | Waukesha County | 5,803 | $117,759 | $536,900 |
| 53190 | Whitewater | Walworth County | 20,499 | $66,069 | $363,600 |
| 53523 | Cambridge | Dane County | 5,074 | $102,188 | $431,100 |
| 53534 | Edgerton | Rock County | 12,241 | $89,045 | $353,000 |
| 53559 | Marshall | Dane County | 6,110 | $93,571 | $415,900 |
| 53563 | Milton | Rock County | 11,280 | $89,528 | $383,100 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Jefferson County
Nearby counties
Frequently asked questions
How many ZIP codes are in Jefferson County, Wisconsin?
10 ZIP codes are mainly in Jefferson County, and 9 more ZIP codes from neighboring areas reach partly into it.
What cities are in Jefferson County?
ZIP codes in Jefferson County use the city names Fort Atkinson, Helenville, Ixonia, Jefferson, Johnson Creek, Lake Mills, Palmyra, Sullivan, Waterloo and Watertown.
What metro area is Jefferson County in?
Jefferson County is part of the Watertown-Fort Atkinson, WI micropolitan statistical area.