† Citizen voting-age population estimated for prior cycles; 2004 predates the ACS and is extrapolated. Source: ACS 5-year, table B05003.
——
D+60R+60
20042024
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupJanesvilleWisconsinUnited States
German33.8%35.8%12.5%
Irish13.9%10.4%9.4%
English10.6%6.7%9.5%
Norwegian10.6%6.1%—
American5.9%3.4%5.3%
Polish3.5%7.6%2.2%
Italian3.1%2.7%4.8%
French1.9%2.2%1.6%
Mexican6.4%5.4%11.3%
Puerto Rican0.4%1.1%1.8%
Dominican0.2%—0.7%
Colombian0.2%—0.4%
African American†2.8%5.3%9.9%
African0.2%0.2%0.5%
Chinese0.3%0.4%1.3%
Cambodian0.3%——
Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.
Age and life stage
Measure
Janesville
Wisconsin
United States
Median age
40.7
40.5
39.1
Age 18–24
8.5%
9.3%
9.2%
Age 65 and older
18.2%
18.5%
17.2%
Household economy
Measure
Janesville
Wisconsin
United States
Median household income
$73,446
$77,485
$84,427
Poverty rate
9.0%
10.6%
12.5%
Bachelor's degree or higher (25+)
27.3%
33.5%
35.6%
Languages at home
Measure
Janesville
Wisconsin
United States
Speaks a non-English language at home
7.5%
9.1%
22.3%
Spanish
5.5%
5.0%
13.6%
Religious landscape
Measure
Janesville
Wisconsin
United States
Catholic
—
21.0%
18.6%
Evangelical Protestant
—
14.5%
16.5%
Unclaimed / not counted
—
52.0%
51.5%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
Janesville, Wisconsin
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
+20.5%
2008
+33.2%
2012
+25.0%
2016
+14.9%
2020
+18.0%
2024
+14.5%
DemocraticRepublican
6 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year. Third-party votes in 2012 are allocated from certified county totals by this place's share of each county's two-party vote — that cycle's precinct source records two-party splits. † 2004 sub-county results are estimated: the source's block-level detail for this cycle was unreliable — either county/municipality-level consolidated reporting (COVID-era) or a precinct-to-block allocation that misplaced votes — so the figures are allocated from the constituent county totals in proportion to the place and scaled to certified totals.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
D
56.4%Harris19,916
41.9%Trump14,785
1.7%
D+14.5
R+3.4
D+16.0
35,303
D
58.0%Biden19,589
40.0%Trump13,523
2.0%
D+18.0
D+3.1
D+13.5
33,774
D
53.8%Clinton16,182
38.9%Trump11,705
7.3%
D+14.9
R+10.1
D+12.8
30,081
D
61.9%Obama20,000
36.9%Romney11,933
1.2%
D+25.0
R+8.2
D+21.1
32,315
D
65.9%Obama21,384
32.7%McCain10,617
1.4%
D+33.2
D+12.7
D+25.9
32,465
D
59.6%Kerry19,692
39.1%Bush12,924
1.3%
D+20.5
—
D+22.9
33,049
Janesville lost its General Motors assembly plant in 2008 after a century of auto manufacturing, a closure that reshaped its economy and made it a closely watched bellwether for working-class voter realignment in southwestern Wisconsin.
Across the recorded series it reached a Democratic high of 33.2 points in 2008. Between 2020 and 2024 the city moved 3.4 points toward the Republican candidate; the 2024 margin was 14.5 points.
A population of 66,030, a 85% non-Hispanic-white share, and a median household income of $73,446 describe the city. The city's voting pattern over the last decade is most similar to that of Dubuque and Cedar Rapids.
Akashic
Political twins — cities
The cities whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
In 2024, Janesville, Wisconsin voted Democratic by 14.5 points (D+14.5), carried by the Democratic candidate. Out of 35,303 votes cast, 19,916 went Democratic and 14,785 went Republican.
How many people live in Janesville, Wisconsin?
Janesville, Wisconsin has a population of 66,030 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Janesville, Wisconsin?
Median household income in Janesville, Wisconsin is $73,446 — below the national median of $80,734. The Wisconsin state median is $77,485.
What is the political history of Janesville, Wisconsin?
Akashic tracks 6 presidential elections in Janesville, Wisconsin from 2004 to 2024. Of those, 6 went Democratic and 0 went Republican.
