Jefferson County, Wisconsin: Industrial Catholic Metro county. In 2024, voted R+16%. Republican peak: R+64 in 1920.
Key facts
- 2024 presidential margin
- R+16MIT Election Lab
- Political typology
- Industrial Catholic MetroAkashic typology
- Population
- 86,0032024 5-year
- Median household income
- $83,7502024 5-year
- White (non-Hispanic)
- 88.6%2024 5-year
- Black
- 0.9%2024 5-year
- Hispanic / Latino
- 8.5%2024 5-year
- Peak Democratic margin
- D+38 in 1932MIT Election Lab
- Peak Republican margin
- R+64 in 1920MIT Election Lab
- Most similar
- Calumet County, WI · similarity 0.99
2024 results by precinct
2024 precinct map of Jefferson CountyPrecinct-level 2024 presidential results for Jefferson County, with each precinct boundary colored by Democratic-vs-Republican margin.
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Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | +26.2% |
| 1896 | −10.2% |
| 1900 | +4.9% |
| 1904 | +1.4% |
| 1908 | +16.2% |
| 1912 | +35.0% |
| 1916 | −1.8% |
| 1920 | −63.7% |
| 1924 | −21.1% |
| 1928 | −15.3% |
| 1932 | +37.5% |
| 1936 | +32.0% |
| 1940 | −12.9% |
| 1944 | −18.8% |
| 1948 | −6.3% |
| 1952 | −34.0% |
| 1956 | −34.6% |
| 1960 | −23.4% |
| 1964 | +20.6% |
| 1968 | −16.6% |
| 1972 | −21.6% |
| 1976 | −10.2% |
| 1980 | −16.1% |
| 1984 | −24.3% |
| 1988 | −9.5% |
| 1992 | −4.5% |
| 1996 | +1.7% |
| 2000 | −11.1% |
| 2004 | −13.9% |
| 2008 | +0.8% |
| 2012 | −7.6% |
| 2016 | −15.9% |
| 2020 | −15.2% |
| 2024 | −16.3% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 20,574 | 28,771 | 50,146 | ||
| R | 19,904 | 27,208 | 47,979 | ||
| R | 16,569 | 23,417 | 43,109 | ||
| R | 20,158 | 23,517 | 44,281 | ||
| D | 21,448 | 21,096 | 43,166 | ||
| R | 17,925 | 23,776 | 42,115 | ||
| R | 15,203 | 19,204 | 36,099 | ||
| D | 13,188 | 12,681 | 29,774 | ||
| R | 11,593 | 13,072 | 32,802 | ||
| R | 11,816 | 14,309 | 26,342 | ||
| R | 10,788 | 17,780 | 28,784 | ||
| R | 11,335 | 16,174 | 30,000 | ||
| R | 12,577 | 15,528 | 28,812 | ||
| R | 9,303 | 14,621 | 24,587 | ||
| R | 8,716 | 12,478 | 22,698 | ||
| D | 13,295 | 8,741 | 22,084 | ||
| R | 8,757 | 14,133 | 22,929 | ||
| R | 6,452 | 13,357 | 19,931 | ||
| R | 6,827 | 13,884 | 20,743 | ||
| R | 7,256 | 8,244 | 15,728 | ||
| R | 6,988 | 10,245 | 17,317 | ||
| R | 7,842 | 10,178 | 18,169 | ||
| D | 11,144 | 5,599 | 17,324 | ||
| D | 11,230 | 5,062 | 16,448 | ||
| R | 6,305 | 8,612 | 15,033 | ||
| O | 1,374 | 4,250 | 13,611 | ||
| R | 1,844 | 8,865 | 11,029 | ||
| R | 3,645 | 3,785 | 7,636 | ||
| D | 4,381 | 1,926 | 7,021 | ||
| D | 4,492 | 3,207 | 7,932 | ||
| D | 3,778 | 3,669 | 7,696 | ||
| D | 4,127 | 3,729 | 8,063 | ||
| R | 3,504 | 4,344 | 8,257 | ||
| D | 4,661 | 2,679 | 7,575 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
46.1%
Irish
11.1%
Polish
6.7%
English
5.8%
American
3.7%
Italian
3.1%
French
2.4%
Sample size too small to break out by ancestry reliably.
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 41.5 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$83,750
Jefferson County ranks in the top 25% of US counties.
Jefferson County$83,750
Wisconsin$77,485
United States$80,734
Jefferson County ranks in the top 25% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
8.1%
Child poverty is below the national average.
Children under 189.8%
Working age (18–64)7.5%
Seniors (65+)9.7%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
93.7%
speak English only
Spanish5.0%
Other Indo-European0.9%
Asian & Pacific Islander0.4%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 49.0% of residents not counted as adherents by any reporting body.
Jefferson County sits in the Glacial Drumlin region southwest of Milwaukee, where a manufacturing and agricultural economy anchors a largely white, working-class electorate. Its 2024 margin of R+16.4 reflects a long drift from the competitive swings it recorded in the early 2000s.
Its margins are typically close. The Democratic margin reached thirty-eight points in 1932; the Republican margin reached sixty-four points in 1920. Between 2020 and 2024 the county moved one point toward the Republican candidate; the 2024 margin was sixteen points.
Its demographics sit near national norms: a 89% non-Hispanic-white share, a median household income of $83,750, and a 8% poverty rate. The county's voting pattern over the last decade is most similar to that of Calumet County and Dubois County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Jefferson County, Wisconsin. Akashic. https://akashic.app/county/55055/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More industrial catholic metro counties
Frequently asked questions
How did Jefferson County, Wisconsin vote in 2024?
In 2024, Jefferson County, Wisconsin voted Republican by 16.3 points (R+16), carried by the Republican candidate. Out of 50,146 votes cast, 20,574 went Democratic and 28,771 went Republican.
What is Jefferson County, Wisconsin's political typology?
Akashic places Jefferson County, Wisconsin in the "Industrial Catholic Metro" typology — Mid-size industrial metros with Catholic ethnic roots — among the most competitive, swing-prone ground in the country. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 10 times, Republican 23 times, and other 1 times.
When did Jefferson County, Wisconsin last vote Democratic?
The most recent presidential election in which Jefferson County, Wisconsin voted Democratic was 2008.
How many people live in Jefferson County, Wisconsin?
Jefferson County, Wisconsin has a population of 86,003 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Jefferson County, Wisconsin?
Median household income in Jefferson County, Wisconsin is $83,750 — above the national median of $80,734. The Wisconsin state median is $77,485.
What is the political history of Jefferson County, Wisconsin?
Akashic tracks 38 presidential elections in Jefferson County, Wisconsin from 1876 to 2024. Of those, 10 went Democratic and 23 went Republican. The county's typology — "Industrial Catholic Metro" — captures where that record, its demographics, and its recent swing place it among American communities.