County ProfileWI
Jefferson County
Population: 84,900 · 11 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
84,900
People
Median age
41.5
Housing
Total households
34,873
Income
Median household income
$83,750
Housing
Total housing units
36,890
Employment
Employment rate
65.8%
Education
Bachelor’s degree or higher
28.5%
Healthcare
Insured population
95.2%
County details
Local time 01:09:45(CT)| Name | Jefferson |
|---|---|
| Total ZIP codes | 11total |
| ZIP codes (by type) | 11 Standard |
| Area code | 262, 274, 920 |
| Timezone | Central Time (CT) |
| Coordinates | 43.0138045, -88.7739847 |
| Land area | 556.5 sq miles(1,441.3 km²) |
Map of Jefferson county, Wisconsin with ZIP codes
Cities and Communities in Jefferson County
Compare the largest cities in Jefferson County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Watertown | 22,926 | $70,107 | 2ZIPs |
| Fort Atkinson | 12,579 | $79,302 | 1ZIPs |
| Jefferson | 7,793 | $79,006 | 1ZIPs |
| Lake Mills | 6,211 | $91,027 | 1ZIPs |
| Waterloo | 3,492 | $87,776 | 1ZIPs |
| Johnson Creek | 3,318 | $100,685 | 1ZIPs |
| Ixonia | 2,367 | $93,359 | 1ZIPs |
| Palmyra | 1,719 | $86,058 | 1ZIPs |
| Sullivan | 651 | $71,250 | 1ZIPs |
| Helenville | 238 | — | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Jefferson County
Review the most populated postal areas across Jefferson County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 53538 | Fort Atkinson | $82,783 | 18,643 |
| 53094 | Watertown | $73,443 | 18,510 |
| 53098 | Watertown | $74,431 | 11,562 |
| 53549 | Jefferson | $80,101 | 10,199 |
| 53551 | Lake Mills | $94,401 | 8,920 |
| 53594 | Waterloo | $88,390 | 5,324 |
| 53038 | Johnson Creek | $96,127 | 4,372 |
| 53036 | Ixonia | $92,674 | 3,540 |
| 53156 | Palmyra | $85,313 | 2,972 |
| 53178 | Sullivan | $99,875 | 2,703 |
| 53137 | Helenville | $116,550 | 1,702 |
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS