Jefferson County, Wisconsin
Jefferson County: county in Wisconsin, United States
About
Jefferson County is a county located in the U.S. state of Wisconsin. As of the 2010 census, the population was 83,686 and a population density of 55 people per km². After 10 years in 2020 county had an estimated population of 85,038 inhabitants. Its county seat is Jefferson. The county was created 190 years ago in 1835.
County Snapshot
Jefferson County at a glance
Jefferson County currently has 18 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
18
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
Wisconsin counties
72
Open related pagesLargest city
Fort AtkinsonPopulation 12,372
Top linked places
Quick Facts about Jefferson County
| Population | 85,038 (2020) |
| Country | United States of America |
| State | Wisconsin (United States) |
| Area | 1509 km2 |
| Water as percent of area | 4.5% |
| Land as percent of area | 95.5% |
| Latitude & Longitude | 43.0208,-88.7759 |
| Named for | Thomas Jefferson |
| Capital | Jefferson |
| Establishment | January 01, 1836 |
| Time Zone | America/Chicago |
| Local time | 03:54:06 (19th April 2026) |
| Density | 56 Pop. per km² as of 2020 |
| Population growth | 1.59% (2010-2020) |
| Weather | 30℉ Mostly Clear 7-days weather |
Geography
Jefferson County is located at 43°1'15"N 88°46'33"W (43.0208200, -88.7758700). It has 5 neighbors: Dane County, Dodge County, Rock County, Walworth County and Waukesha County.
Jefferson County map
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The largest city of Jefferson County is Fort Atkinson with a population of 12,372. Other cities include, Ixonia population 4,562, Farmington population 3,848, Johnson Creek population 3,065 and Sullivan population 2,299. See all Jefferson County cities & populated places.
Jefferson County Populated Places (more)
Cities, towns, neighborhoods & other populated places in Jefferson County.
| City Name | Population | Title |
|---|---|---|
| Fort Atkinson | 12,372 | City in Jefferson County, Wisconsin, United States of America |
| Ixonia | 4,562 | Town of Wisconsin |
| Farmington | 3,848 | Town in Jefferson County, Wisconsin, United States |
| Johnson Creek | 3,065 | City in Jefferson County, Wisconsin, United States of America |
| Rome | 2,784 | Census-designated place in Jefferson County, Wisconsin, United States |
| Sullivan | 2,299 | Village in Jefferson County, Wisconsin |
| Lake Mills | 2,135 | City in Iowa, USA |
| Concord | 2,130 | Town in Wisconsin, United States |
| Watertown | 2,039 | City in Jefferson County, New York |
| Lake Ripley | 1,779 | Census designated place |
| Aztalan | 1,493 | Civil town in Jefferson County, Wisconsin |
| Jefferson | 1,225 | City in and county seat of Jefferson County, Wisconsin |
| Palmyra | 1,219 | Civil town in Jefferson County, Wisconsin |
| Lake Koshkonong | 1,204 | Census designated place |
| Milford | 1,135 | City in Jefferson County, Wisconsin, United States of America |
| Hebron | 1,132 | Town of Wisconsin |
Weather
Mostly clear, with a low around 30. West wind 5 to 10 mph.
7-Day ForecastOfficial website of Jefferson County
Official Website- Jefferson
Demographics
The population of Jefferson County increased by 1.59% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 83,686 | - | census |
| 2011 | 83,846 | 0.19% | estimation process |
| 2012 | 84,359 | 0.61% | estimation process |
| 2013 | 84,604 | 0.29% | estimation process |
| 2014 | 84,361 | -0.29% | estimation process |
| 2015 | 84,488 | 0.15% | estimation process |
| 2016 | 84,464 | -0.03% | estimation process |
| 2017 | 84,733 | 0.32% | estimation process |
| 2018 | 85,049 | 0.37% | estimation process |
| 2019 | 84,769 | -0.33% | estimation process |
| 2020 | 85,038 | 0.32% | estimation process |
People born in Jefferson County (4)
People born in Jefferson County, including writer-actor Meinhardt Raabe, poet Lorine Niedecker, Chick Agnew, .
More notable people
- John Donald Black (American economist) he was born in 06/06/1883
Other places with the same name (24)
- Jefferson County, Kentucky county in Alabama, United States with a population of 767,452 people.
- Jefferson County, Alabama county in Alabama, United States with a population of 655,342 people.
- Jefferson County, Colorado county in Colorado, United States with a population of 583,283 people.
- Jefferson County, Texas county in Texas, United States with a population of 250,127 people.
- Jefferson County, Missouri county in Missouri, United States with a population of 226,543 people.
- Jefferson County, New York county in New York, United States with a population of 108,095 people.
- Jefferson County, Arkansas county in Arkansas, United States with a population of 65,377 people.
- Jefferson County, Ohio county in Ohio, United States with a population of 64,939 people.
- Jefferson County, West Virginia county in West Virginia, United States with a population of 57,486 people.
- Jefferson County, Tennessee county in Tennessee, United States with a population of 55,307 people.
- Jefferson County, Pennsylvania county in Pennsylvania, United States with a population of 43,108 people.
- Jefferson County, Illinois county in Illinois, United States with a population of 37,235 people.
- Jefferson County, Washington county in the state of Washington, United States with a population of 32,700 people.
- Jefferson County, Indiana county in Indiana, United States with a population of 32,110 people.
- Jefferson County, Idaho county in Idaho, United States with a population of 29,871 people.
- Jefferson County, Oregon county in Oregon, United States with a population of 24,856 people.
- Jefferson County, Kansas county in Kansas, United States with a population of 19,032 people.
- Jefferson County, Iowa county in Iowa, United States with a population of 18,347 people.
- Jefferson County, Georgia county in Georgia, United States with a population of 15,267 people.
- Jefferson County, Florida county in Florida, United States of America with a population of 14,543 people.
- Jefferson County, Montana county in Montana, United States with a population of 12,360 people.
- Jefferson County, Nebraska county in Nebraska, United States with a population of 7,099 people.
- Jefferson County, Mississippi county in Mississippi, United States with a population of 6,997 people.
- Jefferson County, Oklahoma county in Oklahoma, United States with a population of 5,949 people.
Wisconsin Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Milwaukee County | 945,016 | County in Wisconsin, United States |
| Milwaukee | 589,067 | The thirtieth most populous city in the United States and the center of the Milwaukee metropolitan area. |
| Dane County | 552,536 | County in Wisconsin, United States |
| Waukesha County | 406,172 | County in Wisconsin, United States |
| Brown County | 264,610 | County in Texas, United States |
| Racine County | 195,802 | County in Wisconsin, United States |
| Outagamie County | 188,766 | County in Wisconsin, United States |
| Winnebago County | 171,631 | County in Wisconsin, United States |
| Kenosha County | 169,671 | County in Wisconsin, United States |
| Rock County | 163,084 | County in Wisconsin, United States |
| Washington County | 136,445 | County in Wisconsin, United States |
| Marathon County | 135,593 | County in Wisconsin, United States |
| La Crosse County | 118,502 | County in Wisconsin, United States |
| Sheboygan County | 115,240 | County in Wisconsin, United States |
| Eau Claire County | 105,260 | County in Wisconsin, United States |
| Walworth County | 103,953 | County in Wisconsin, United States |