City · Wisconsin
Janesville, Wisconsin
Janesville, city, in Rock County, Wisconsin. Janesville had 66,929 residents on July 1, 2025 by the Census Bureau's estimate, up 2.0% since 2020; the 2020 Census counted 65,615 and the ACS 2020-2024 5-year estimates put it at 66,030 (±50). GEOID 5537825.
Residents, July 2025 estimate
66,929
Census Bureau estimate (no margin published)
2020 Census count: 65,615 · ACS 2020-2024: 66,030 ±50
Median household income
$73,446
±$3,826 (90% margin)
Wisconsin: $77,485
Median home value
$223,400
±$4,913 (90% margin)
Wisconsin: $266,500
Median gross rent
$1,054
±$40 (90% margin)
Wisconsin: $1,087
Where is Janesville and what county is it in?
Janesville is a city in Rock County, Wisconsin. It covers 34.6 square miles of land, 1,894 residents per square mile in 2020.
Janesville is in the Janesville-Beloit, WI metropolitan statistical area (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Janesville, and is it growing?
The Census Bureau estimates that 66,929 people lived in Janesville on July 1, 2025, up 2.0% since 2020, faster than Wisconsin (+1.3%). The 2020 Census counted 65,615 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 66,030 (±50).
| Measure | Janesville | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 66,030 ±50 | 164,350 | +1,785 |
| Households | 28,326 ±635 | 67,201 | +1,667 |
| Average household size | 2.30 ±0.05 | 2.41 | −0.07 |
| Housing units | 29,330 ±557 | 71,109 | +1,525 |
Janesville's population since 2000
From 59,498 in 2000 to 66,929 in 2025: up 12.5%. The 2000, 2010 and 2020 figures are census counts, each for Janesville as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Janesville?
The median resident of Janesville is 40.7 years old; 21.2% are under 18 and 18.2% are 65 or older. The largest group is non-Hispanic white residents at 83.8%, then Hispanic or Latino residents (of any race) at 7.8%. 3.8% of residents were born outside the United States.
| Measure | Janesville | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 40.7 ±1.2 | 40.3 | no clear change |
| Under 18 years | 21.2% ±0.9 pts | 22.4% | – |
| 65 years and over | 18.2% ±0.9 pts | 17.8% | – |
| Male | 49.1% ±0.9 pts | 49.8% | – |
| Hispanic or Latino (any race) | 7.8% ±1.3 pts | 10.1% | +2.4 pts |
| White alone, not Hispanic | 83.8% ±1.5 pts | 79.6% | −4.8 pts |
| Black or African American alone, not Hispanic | 3.0% ±0.8 pts | 4.6% | no clear change |
| Asian alone, not Hispanic | 1.6% ±0.4 pts | 1.1% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.0% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 3.5% ±0.7 pts | 4.2% | – |
| Some other race alone, not Hispanic | 0.3% ±0.3 pts | 0.3% | – |
| Born outside the United States | 3.8% ±0.7 pts | 4.6% | no clear change |
| Speak a language other than English at home (age 5+) | 7.5% ±1.4 pts | 8.8% | – |
| Civilian veterans (age 18+) | 6.7% ±0.7 pts | 6.9% | – |
| With a disability | 13.0% ±1.0 pts | 12.8% | – |
| No health insurance coverage | 5.6% ±1.0 pts | 5.5% | no clear change |
| High school graduate or higher (age 25+) | 94.4% ±0.8 pts | 92.6% | – |
| Bachelor's degree or higher (age 25+) | 27.3% ±1.9 pts | 25.8% | +3.7 pts |
| Graduate or professional degree (age 25+) | 8.5% ±1.2 pts | 8.1% | – |
| Lived in the same house a year earlier | 90.7% ±1.4 pts | 90.6% | – |
| Moved from another state in the past year | 1.7% ±0.6 pts | 1.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Janesville earn?
Half of Janesville's 28,326 households earn less than $73,446 a year (±$3,826), against $75,673 in Rock County and $77,485 in Wisconsin. In 2015-2019 it was $69,279 in 2024 dollars; the margins of error cannot tell the two periods apart. 9.0% of residents live below the poverty line.
| Measure | Janesville | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $73,446 ±$3,826 | $75,673 | no clear change |
| Mean household income | $85,681 ±$2,693 | $91,984 | – |
| Per capita income | $37,762 ±$1,423 | $38,536 | no clear change |
| People below the poverty line | 9.0% ±1.3 pts | 9.3% | −2.5 pts |
| Children under 18 below the poverty line | 11.7% ±3.4 pts | 12.9% | −4.7 pts |
| Households receiving SNAP | 12.8% ±1.6 pts | 12.9% | – |
| Households with a computer | 96.5% ±0.8 pts | 95.5% | – |
| Households with a broadband subscription | 91.3% ±1.7 pts | 90.3% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Janesville?
Owners occupy 67.3% of Janesville's occupied homes and renters 32.7%. The median owner-occupied home is valued at $223,400 by its owner (±$4,913). The median renter pays $1,054 a month including utilities, and 34.4% of renters pay 35% or more of their income on rent.
| Measure | Janesville | Rock County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $223,400 ±$4,913 | $231,600 | +$48,026 |
| Median gross rent | $1,054 ±$40 | $1,037 | no clear change |
| Renters paying 35% or more of income on rent | 34.4% ±4.2 pts | 35.0% | no clear change |
| Median monthly owner costs, with a mortgage | $1,510 ±$44 | $1,538 | – |
| Owner-occupied homes | 67.3% ±2.2 pts | 71.2% | no clear change |
| Renter-occupied homes | 32.7% ±2.2 pts | 28.8% | – |
| Housing units | 29,330 ±557 | 71,109 | +1,525 |
| Homeowner vacancy rate | 0.2% ±0.3 pts | 1.0% | – |
| Rental vacancy rate | 2.4% ±1.4 pts | 3.7% | – |
| Single-family detached homes | 67.8% ±1.9 pts | 74.4% | – |
| Mobile homes | 2.1% ±0.6 pts | 2.6% | – |
| Built 2020 or later | 1.3% ±0.6 pts | 1.2% | – |
| Built 2010 to 2019 | 3.8% ±0.8 pts | 4.3% | – |
| Built 1939 or earlier | 14.2% ±1.3 pts | 19.2% | – |
| Households with no vehicle | 5.9% ±1.4 pts | 6.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Janesville building?
Builders took permits for 75 new housing units in Janesville in 2025 (59 in single-family houses), 1.1 per 1,000 residents against 4.3 across Wisconsin.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Janesville work and get to work?
80.0% of Janesville's workers drive alone and 9.5% work from home. The average trip to work takes 21.9 minutes. The unemployment rate in 2020-2024 averaged 4.1%.
| Measure | Janesville | Rock County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.5% ±1.7 pts | 65.2% | – |
| Unemployment rate | 4.1% ±1.0 pts | 3.8% | no clear change |
| Drove alone to work | 80.0% ±1.8 pts | 80.1% | – |
| Carpooled | 7.3% ±1.1 pts | 7.2% | – |
| Public transportation | 0.6% ±0.3 pts | 0.5% | – |
| Walked | 1.4% ±0.4 pts | 1.7% | – |
| Worked from home | 9.5% ±1.3 pts | 9.2% | +6.7 pts |
| Mean travel time to work | 21.9 min ±1.1 | 23.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Janesville?
15 census tracts lie mostly in Janesville, and 3 more reach into it (2020 census blocks). Their median household incomes run from $22,204 (Tract 1) to $124,925 (Tract 13.03).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 13.06Rock County | 5,054 | $54,574 |
| Tract 11Rock County | 4,904 | $66,600 |
| Tract 5Rock County | 4,582 | $73,311 |
| Tract 8Rock County | 4,282 | $83,472 |
| Tract 7Rock County | 4,204 | $62,436 |
| Tract 4Rock County | 3,936 | $65,876 |
| Tract 13.02Rock County | 6,342 | $83,944 |
| Tract 13.05Rock County | 3,923 | $104,306 |
| Tract 6Rock County | 3,459 | $66,444 |
| Tract 9Rock County | 3,258 | $91,175 |
| Tract 12.01Rock County | 6,423 | $90,597 |
| Tract 10Rock County | 3,047 | $49,801 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Janesville) · Census block assignment files
How does Janesville compare with other places in Wisconsin?
By the Census Bureau's July 2025 estimates, Janesville is the 585th-most populous of the 19,476 U.S. incorporated places that have one and the 10th-most populous of 608 in Wisconsin.
Janesville ranks 652nd of 914 places in Wisconsin with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 10th | 608 |
| Growth 2020-2025 (PEP) | 288th | 884 |
| Residents per square mile | 68th | 914 |
| Median household income | 652nd | 914 |
| Per capita income | 668th | 911 |
| Median home value | 655th | 913 |
| Median gross rent | 357th | 825 |
| Poverty rate | 272nd | 706 |
| Bachelor's degree or higher | 438th | 914 |
| Median age | 654th | 914 |
| Owner-occupied share | 724th | 914 |
| Work from home | 556th | 827 |
| Travel time to work | 587th | 914 |
Janesville's figures with every place in Wisconsin (CSV)
Every place in Wisconsin, sortable · Compare Janesville with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Janesville?
4 of the 57 figures for Janesville on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Janesville are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Janesville.