|— City —|
|Nickname(s): The Gemütlichkeit City|
|• Type||Mayor - Council|
|• Mayor||Dale Oppermann|
|• Total||5.93 sq mi (15.36 km2)|
|• Land||5.72 sq mi (14.81 km2)|
|• Water||0.21 sq mi (0.54 km2)|
|Elevation||801 ft (244 m)|
|• Estimate (2011)||7,997|
|• Density||1,393.9/sq mi (538.2/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||1567111|
Jefferson is a city in Jefferson County, Wisconsin, United States, and is its county seat. It is located at the confluence of the Rock and Crawfish rivers. The population was 7,973 at the 2010 census. The city is located partially within the Town of Jefferson.
The location of Jefferson was selected to make use of the water power and transportation opportunities offered by the Rock River. It was the furthest point that a steamboat was able to navigate the Rock in 1839. Later bridges built downstream prevented such navigation.
During World War II, Camp Jefferson, a prison camp for German POWs, was erected at the Jefferson County Fairgrounds. The Jefferson County Fairgrounds hosted horse buggy racing prior to the renovations to the new fairgrounds.
Jefferson is located at (43.003091, -88.807855).
Jefferson's elevation is 797 ft (243 m) at the center of downtown.
 2010 census
As of the census of 2010, there were 7,973 people, 3,132 households, and 1,989 families residing in the city. The population density was 1,393.9 inhabitants per square mile (538.2 /km2). There were 3,378 housing units at an average density of 590.6 per square mile (228.0 /km2). The racial makeup of the city was 91.2% White, 0.7% African American, 0.4% Native American, 0.7% Asian, 0.1% Pacific Islander, 5.4% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 11.8% of the population.
There were 3,132 households out of which 32.5% had children under the age of 18 living with them, 47.8% were married couples living together, 10.4% had a female householder with no husband present, 5.3% had a male householder with no wife present, and 36.5% were non-families. 29.8% of all households were made up of individuals and 13.2% had someone living alone who was 65 years of age or older. The average household size was 2.42 and the average family size was 3.00.
The median age in the city was 37.5 years. 24.4% of residents were under the age of 18; 7.8% were between the ages of 18 and 24; 27.8% were from 25 to 44; 24.4% were from 45 to 64; and 15.7% were 65 years of age or older. The gender makeup of the city was 49.8% male and 50.2% female.
 2000 census
As of the census of 2000, there were 7,338 people, 2,816 households, and 1,819 families residing in the city. The population density was 1,645.9 people per square mile (635.3/km²). There were 2,934 housing units at an average density of 658.1 per square mile (254.0/km²). The racial makeup of the city was 94.28% White, 0.53% Black or African American, 0.55% Native American, 0.46% Asian, 0.03% Pacific Islander, 3.04% from other races, and 1.12% from two or more races. 6.79% of the population were Hispanic or Latino of any race.
There were 2,816 households out of which 30.9% had children under the age of 18 living with them, 50.8% were married couples living together, 10.2% had a female householder with no husband present, and 35.4% were non-families. 28.3% of all households were made up of individuals and 12.0% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.96.
In the city the population was spread out with 22.8% under the age of 18, 9.8% from 18 to 24, 31.4% from 25 to 44, 20.1% from 45 to 64, and 16.1% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 98.4 males. For every 100 females age 18 and over, there were 94.7 males.
The median income for a household in the city was $40,962, and the median income for a family was $47,737. Males had a median income of $32,500 versus $25,142 for females. The per capita income for the city was $19,124. About 5.4% of families and 8.3% of the population were below the poverty line, including 11.2% of those under age 18 and 7.0% of those age 65 or over
In Jefferson there are six schools: two elementary schools, one middle school, one high school, and two private schools. In 1939, East Elementary School was built as a public works project during the Great Depression. The names of the schools are East Elementary, West Elementary, Jefferson Middle School, Jefferson High School, St. John's Catholic, and St. John's Lutheran.
Renew Energy is an ethanol plant located in Jefferson. There is also a large Purina Cat Food Manufacturing plant, a Tyson Foods Plant, and the Home Power Products Division of Briggs & Stratton Corporation (closed in 2009.)
 Notable people
- Claire B. Bird, Wisconsin state senator, born in Jefferson
- Paul M. Blayney, U.S. Coast Guard admiral
- Kenneth E. Gruennert, Medal of Honor recipient, attended school in Jefferson
- Robert Kirkland Henry, congressman, born in Jefferson
- Rosemary Kennedy, sister of President John F. Kennedy
- Zeke Sanborn, Olympic gold medalist, born in Jefferson
- "US Gazetteer files 2010". United States Census Bureau. Retrieved 2012-11-18.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "American FactFinder". United States Census Bureau. Retrieved 2012-11-18.
- "Population Estimates". United States Census Bureau. Retrieved 2013-01-02.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data (DP-1): Jefferson city, Wisconsin". U.S. Census Bureau, American Factfinder. Retrieved October 4, 2012.
- Wisconsin Historical Society - 1907 newspaper
- Untitled Document
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
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