Johnson County, Illinois: Farm Belt county. In 2024, voted R+58%. Republican peak: R+59 in 2020.
Key facts
- 2024 presidential margin
- R+58MIT Election Lab
- Political typology
- Farm BeltAkashic typology
- Population
- 13,3762024 5-year
- Median household income
- $62,5282024 5-year
- White (non-Hispanic)
- 80.5%2024 5-year
- Black
- 7.8%2024 5-year
- Hispanic / Latino
- 4.5%2024 5-year
- Peak Democratic margin
- D+3 in 1992MIT Election Lab
- Peak Republican margin
- R+59 in 2020MIT Election Lab
- Most similar
- Todd County, KY · similarity 1.00
2024 results by precinct
2024 precinct map of Johnson CountyPrecinct-level 2024 presidential results for Johnson 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 | −27.8% |
| 1896 | −17.2% |
| 1900 | −20.4% |
| 1904 | −35.7% |
| 1908 | −27.9% |
| 1912 | −2.5% |
| 1916 | −27.8% |
| 1920 | −43.8% |
| 1924 | −26.0% |
| 1928 | −42.3% |
| 1932 | −0.8% |
| 1936 | −17.2% |
| 1940 | −25.8% |
| 1944 | −36.7% |
| 1948 | −29.4% |
| 1952 | −34.6% |
| 1956 | −31.5% |
| 1960 | −32.5% |
| 1964 | −11.2% |
| 1968 | −31.8% |
| 1972 | −37.2% |
| 1976 | −5.1% |
| 1980 | −33.0% |
| 1984 | −35.0% |
| 1988 | −19.7% |
| 1992 | +3.2% |
| 1996 | −4.7% |
| 2000 | −25.3% |
| 2004 | −37.2% |
| 2008 | −34.6% |
| 2012 | −42.0% |
| 2016 | −57.6% |
| 2020 | −58.6% |
| 2024 | −58.3% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 1,241 | 4,798 | 6,103 | ||
| R | 1,281 | 5,059 | 6,450 | ||
| R | 1,142 | 4,649 | 6,089 | ||
| R | 1,572 | 3,963 | 5,694 | ||
| R | 1,871 | 3,912 | 5,901 | ||
| R | 1,813 | 3,997 | 5,865 | ||
| R | 1,928 | 3,285 | 5,362 | ||
| R | 2,009 | 2,241 | 4,930 | ||
| D | 2,299 | 2,124 | 5,391 | ||
| R | 1,872 | 2,797 | 4,692 | ||
| R | 1,647 | 3,424 | 5,083 | ||
| R | 1,586 | 3,201 | 4,888 | ||
| R | 2,182 | 2,417 | 4,628 | ||
| R | 1,293 | 2,826 | 4,123 | ||
| R | 1,143 | 2,406 | 3,975 | ||
| R | 1,770 | 2,217 | 3,987 | ||
| R | 1,413 | 2,778 | 4,197 | ||
| R | 1,549 | 2,973 | 4,524 | ||
| R | 1,614 | 3,327 | 4,947 | ||
| R | 1,510 | 2,778 | 4,309 | ||
| R | 1,522 | 3,298 | 4,833 | ||
| R | 2,254 | 3,827 | 6,094 | ||
| R | 2,497 | 3,537 | 6,050 | ||
| R | 2,387 | 2,424 | 4,861 | ||
| R | 1,163 | 2,892 | 4,091 | ||
| R | 1,408 | 2,468 | 4,073 | ||
| R | 1,137 | 2,972 | 4,191 | ||
| R | 1,822 | 3,273 | 5,228 | ||
| R | 952 | 1,025 | 2,923 | ||
| R | 1,055 | 1,913 | 3,072 | ||
| R | 980 | 2,164 | 3,321 | ||
| R | 1,271 | 1,940 | 3,287 | ||
| R | 1,429 | 2,027 | 3,484 | ||
| R | 854 | 1,716 | 3,097 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
13.9%
English
11.2%
Irish
10.4%
American
6.4%
Polish
2.5%
Scottish
2.3%
Italian
1.0%
African American
6.2%
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: 41.4 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
$62,528
Johnson County ranks near the middle of US counties.
Johnson County$62,528
Illinois$83,390
United States$80,734
Johnson 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
17.6%
Children face moderate poverty.
Children under 1822.4%
Working age (18–64)16.9%
Seniors (65+)11.9%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
97.7%
speak English only
Spanish1.1%
Other Indo-European1.0%
Asian & Pacific Islander0.2%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 71.7% of residents not counted as adherents by any reporting body.
Tucked into the Shawnee Hills at Illinois's southern tip, Johnson County delivered a 58-point Republican presidential margin in 2024, reflecting the deep rural conservatism that defines the state's southernmost counties.
The Republican margin here reached fifty-nine points in 2020. The 2024 margin was fifty-eight points.
A population of 13,376, a 81% non-Hispanic-white share, and a median household income of $62,528 describe an agricultural county. The county's voting pattern over the last decade is most similar to that of Todd County and Butler 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.
Johnson County, Illinois. Akashic. https://akashic.app/county/17087/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More farm belt counties
Frequently asked questions
How did Johnson County, Illinois vote in 2024?
In 2024, Johnson County, Illinois voted Republican by 58.3 points (R+58), carried by the Republican candidate. Out of 6,103 votes cast, 1,241 went Democratic and 4,798 went Republican.
What is Johnson County, Illinois's political typology?
Akashic places Johnson 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 1 times, Republican 33 times, and other 0 times.
When did Johnson County, Illinois last vote Democratic?
The most recent presidential election in which Johnson County, Illinois voted Democratic was 1992.
How many people live in Johnson County, Illinois?
Johnson County, Illinois has a population of 13,376 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Johnson County, Illinois?
Median household income in Johnson County, Illinois is $62,528 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Johnson County, Illinois?
Akashic tracks 38 presidential elections in Johnson County, Illinois from 1876 to 2024. Of those, 1 went Democratic and 33 went Republican. The county's typology — "Farm Belt" — captures where that record, its demographics, and its recent swing place it among American communities.