According to realtor website
Zillow, the average price of a home as of November 30, 2025, in Janesville is $278,849. As of the 2024
American Community Survey, there are 29,204 estimated households in Janesville with an average of 2.25 persons per household. The city has a median household income of $66,853. Approximately 7.2% of the city's population lives at or below the
poverty line. Janesville has an estimated 65.5% employment rate, with 26.6% of the population holding a bachelor's degree or higher and 92.3% holding a high school diploma. There were 30,223 housing units at an average density of . The median age in the city was 41.1 years.
Racial and ethnic composition 2024 estimate As of the 2024 estimate, there were 66,428 people, 29,204 households, and _ families residing in the city. The population density was . There were 30,223 housing units at an average density of . The racial makeup of the city was 86.8% White
(85.3% NH White), 3.2% African American, 0.4% Native American, 1.6% Asian, 0.0% Pacific Islander, _% from some other races and 5.6% from two or more races. Hispanic or Latino people of any race were 6.2% of the population.
2020 census As of the
2020 census, there were 65,615 people, 27,170 households, and 16,979 families in Janesville, with a population density of . The median age was 39.8 years; 22.5% of residents were under the age of 18 and 17.7% were 65 years of age or older. For every 100 females there were 96.5 males, and for every 100 females age 18 and over there were 93.3 males age 18 and over. 98.8% of residents lived in urban areas, while 1.2% lived in rural areas. Among households, 28.7% had children under the age of 18 living in them. Of all households, 43.7% were married-couple households, 18.8% were households with a male householder and no spouse or partner present, and 28.1% were households with a female householder and no spouse or partner present. About 30.2% of all households were made up of individuals and 12.4% had someone living alone who was 65 years of age or older. Of the population age 25 and over, 93.1% were high school graduates or higher and 25.2% had a bachelor's degree or higher.
2010 census As of the
2010 census, there were 63,575 people, 25,828 households, and 16,718 families residing in the city. The population density was . There were 27,996 housing units at an average density of . The racial makeup of the city was 91.70%
White, 2.57%
African American, 0.29%
Native American, 1.35%
Asian, 0.03%
Pacific Islander, 1.96% from some other races and 2.09% from two or more races.
Hispanic or Latino people of any race were 5.38% of the population. There were 25,828 households, 30.4% had children under the age of 18 living in them, 46.6% were married couples living together, 12.7% had a female householder with no husband present, and 35.3% were non-families. 28.2% of all households were made up of individuals, with 10.6% individuals aged 65 years or older. The average household size was 2.43 and the average family size was 2.95. In the city, the population was spread out, with 21.8% under the age of 18, and 13.9% who were 65 years of age or older. The median age was 37.1 years.
Religion There are four
Roman Catholic parishes in Janesville, all part of the
Diocese of Madison. The oldest is St. Patrick's, established in a log chapel in 1844 when there were only six Catholic families in Janesville. A priest arrived in March 1845 and celebrated Mass. St. Patrick's present church was built of cream-colored brick in 1863 and is located at 315 Cherry Street. Located on a hill near the center of town, the architecturally prominent Nativity of Mary church (St. Mary's) was organized in 1876 by German immigrants who wanted a parish of their own. The present red brick structure was completed in 1902. The remaining two Janesville parishes are St. John Vianney, located on East Racine Street, and St. William on the near west side. The city is also home to other Christian churches including
Lutheran,
Methodist,
Episcopalian,
Baptist, and others. The First Baptist Church of Janesville was organized October 13, 1844, and founded by the Rev. Jeremiah Murphy. The
Seventh Day Baptist General Conference has its offices in Janesville; the denomination's nearest church is in nearby
Milton. All Saints Anglican Catholic Church a part of the
continuing Anglican movement, is located in a historic church near downtown that was built by German Lutherans in the 1880s. There are four cemeteries in Janesville: Oakhill, a municipal cemetery,
Mount Olivet, a
Roman Catholic cemetery, Dillenbeck Cemetery, and Milton Lawns, a non-demominational private cemetery. The
Gideon Bible organization was founded at the Janesville
YMCA in 1899 by Janesville resident John H. Nicholson and a
Beloit man after they had shared a
Boscobel hotel room. Janesville has a mosque. ==Economy==