Jo Daviess County, Illinois: Farm Belt county. In 2024, voted R+17%. Republican peak: R+56 in 1920.
Key facts
- 2024 presidential margin
- R+17MIT Election Lab
- Political typology
- Farm BeltAkashic typology
- Population
- 21,8512024 5-year
- Median household income
- $73,9932024 5-year
- White (non-Hispanic)
- 93.5%2024 5-year
- Black
- 0.8%2024 5-year
- Hispanic / Latino
- 4.2%2024 5-year
- Peak Democratic margin
- D+18 in 1912MIT Election Lab
- Peak Republican margin
- R+56 in 1920MIT Election Lab
- Most similar
- Houston County, MN · similarity 0.98
2024 results by precinct
2024 precinct map of Jo Daviess CountyPrecinct-level 2024 presidential results for Jo Daviess County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
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 | +2.0% |
| 1896 | −19.5% |
| 1900 | −14.7% |
| 1904 | −33.3% |
| 1908 | −14.3% |
| 1912 | +18.2% |
| 1916 | −23.6% |
| 1920 | −56.2% |
| 1924 | −35.1% |
| 1928 | −24.1% |
| 1932 | +9.6% |
| 1936 | −4.9% |
| 1940 | −30.6% |
| 1944 | −32.3% |
| 1948 | −24.3% |
| 1952 | −42.7% |
| 1956 | −39.8% |
| 1960 | −17.5% |
| 1964 | +2.2% |
| 1968 | −24.8% |
| 1972 | −26.9% |
| 1976 | −15.6% |
| 1980 | −28.0% |
| 1984 | −27.2% |
| 1988 | −8.6% |
| 1992 | −2.0% |
| 1996 | +2.8% |
| 2000 | −7.0% |
| 2004 | −7.4% |
| 2008 | +10.5% |
| 2012 | +1.2% |
| 2016 | −14.6% |
| 2020 | −16.4% |
| 2024 | −16.8% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 5,051 | 7,136 | 12,414 | ||
| R | 5,109 | 7,166 | 12,525 | ||
| R | 4,462 | 6,121 | 11,334 | ||
| D | 5,667 | 5,534 | 11,429 | ||
| D | 6,403 | 5,170 | 11,750 | ||
| R | 5,311 | 6,174 | 11,584 | ||
| R | 4,585 | 5,304 | 10,322 | ||
| D | 4,171 | 3,915 | 9,306 | ||
| R | 4,044 | 4,249 | 10,454 | ||
| R | 4,141 | 4,923 | 9,137 | ||
| R | 3,348 | 5,877 | 9,302 | ||
| R | 2,678 | 5,186 | 8,971 | ||
| R | 3,979 | 5,478 | 9,628 | ||
| R | 3,318 | 5,763 | 9,097 | ||
| R | 3,228 | 5,563 | 9,408 | ||
| D | 4,818 | 4,607 | 9,425 | ||
| R | 4,293 | 6,111 | 10,417 | ||
| R | 2,906 | 6,762 | 9,686 | ||
| R | 2,858 | 7,132 | 10,003 | ||
| R | 3,220 | 5,299 | 8,570 | ||
| R | 3,298 | 6,465 | 9,797 | ||
| R | 3,864 | 7,285 | 11,192 | ||
| R | 5,079 | 5,619 | 10,950 | ||
| D | 5,497 | 4,520 | 10,177 | ||
| R | 3,856 | 6,333 | 10,283 | ||
| R | 1,477 | 4,864 | 9,659 | ||
| R | 1,604 | 6,098 | 7,997 | ||
| R | 3,505 | 5,775 | 9,622 | ||
| D | 2,226 | 1,233 | 5,460 | ||
| R | 2,310 | 3,132 | 5,739 | ||
| R | 1,598 | 3,388 | 5,368 | ||
| R | 2,543 | 3,444 | 6,143 | ||
| R | 2,391 | 3,594 | 6,158 | ||
| D | 2,793 | 2,680 | 5,740 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
43.6%
Irish
18.8%
English
10.7%
American
6.4%
Polish
4.1%
Italian
3.4%
French
1.7%
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: 51.5 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
$73,993
Jo Daviess County ranks near the middle of US counties.
Jo Daviess County$73,993
Illinois$83,390
United States$80,734
Jo Daviess County ranks near the middle 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
7.8%
Child poverty is below the national average.
Children under 188.6%
Working age (18–64)8.1%
Seniors (65+)5.4%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
97.4%
speak English only
Spanish1.5%
Other Indo-European0.7%
Asian & Pacific Islander0.3%
Other languages0.1%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 57.4% of residents not counted as adherents by any reporting body.
Jo Daviess County, Illinois's northwestern corner, has shifted steadily toward Republican margins over the past two decades, posting R+16.8 in 2024 despite a modest population of roughly 22,000 spread across river towns and farmland.
The Republican margin here reached fifty-six points in 1920. The 2024 margin was seventeen points.
A population of 21,851, a 94% non-Hispanic-white share, and a median household income of $73,993 describe an agricultural county. The county's voting pattern over the last decade is most similar to that of Houston County and Sandusky 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.
Jo Daviess County, Illinois. Akashic. https://akashic.app/county/17085/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More farm belt counties
Frequently asked questions
How did Jo Daviess County, Illinois vote in 2024?
In 2024, Jo Daviess County, Illinois voted Republican by 16.8 points (R+17), carried by the Republican candidate. Out of 12,414 votes cast, 5,051 went Democratic and 7,136 went Republican.
What is Jo Daviess County, Illinois's political typology?
Akashic places Jo Daviess County, Illinois in the "Farm Belt" typology — Rural Plains and Midwest farm counties — Republican, with modest recent movement. 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 7 times, Republican 27 times, and other 0 times.
When did Jo Daviess County, Illinois last vote Democratic?
The most recent presidential election in which Jo Daviess County, Illinois voted Democratic was 2012.
How many people live in Jo Daviess County, Illinois?
Jo Daviess County, Illinois has a population of 21,851 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Jo Daviess County, Illinois?
Median household income in Jo Daviess County, Illinois is $73,993 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Jo Daviess County, Illinois?
Akashic tracks 38 presidential elections in Jo Daviess County, Illinois from 1876 to 2024. Of those, 7 went Democratic and 27 went Republican. The county's typology — "Farm Belt" — captures where that record, its demographics, and its recent swing place it among American communities.