Williamson County, Illinois: Republican loyalist county. In 2024, voted R+39%. Republican peak: R+41 in 2016.
Key facts
- 2024 presidential margin
- R+39MIT Election Lab
- Political archetype
- Republican loyalistAkashic typology
- Population
- 66,8762024 5-year
- Median household income
- $65,6042024 5-year
- White (non-Hispanic)
- 89.0%2024 5-year
- Black
- 4.5%2024 5-year
- Hispanic / Latino
- 2.9%2024 5-year
- Peak Democratic margin
- D+23 in 1964MIT Election Lab
- Peak Republican margin
- R+41 in 2016MIT Election Lab
- Most similar
- Randolph County, MO · similarity 1.00
2024 results by precinct
2024 precinct map of Williamson CountyPrecinct-level 2024 presidential results for Williamson 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.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 9,890 | 22,686 | 33,068 | ||
| R | 10,206 | 22,801 | 33,730 | ||
| R | 8,581 | 21,570 | 31,852 | ||
| R | 10,647 | 17,909 | 29,254 | ||
| R | 12,589 | 17,039 | 30,141 | ||
| R | 11,685 | 18,086 | 29,960 | ||
| R | 12,192 | 14,012 | 26,939 | ||
| D | 12,510 | 9,734 | 25,272 | ||
| D | 14,361 | 9,462 | 28,760 | ||
| D | 12,712 | 12,274 | 25,130 | ||
| R | 11,614 | 14,930 | 26,630 | ||
| R | 10,779 | 14,451 | 26,228 | ||
| D | 13,600 | 10,703 | 24,553 | ||
| R | 9,202 | 14,101 | 23,492 | ||
| R | 9,660 | 11,886 | 23,588 | ||
| D | 14,613 | 9,130 | 23,743 | ||
| R | 11,335 | 13,732 | 25,096 | ||
| R | 10,345 | 13,438 | 23,810 | ||
| R | 10,838 | 13,348 | 24,223 | ||
| R | 9,841 | 10,386 | 20,357 | ||
| R | 9,974 | 12,594 | 22,671 | ||
| D | 14,645 | 14,433 | 29,217 | ||
| D | 14,663 | 12,319 | 27,334 | ||
| D | 12,961 | 8,714 | 22,265 | ||
| R | 10,139 | 10,913 | 21,309 | ||
| R | 6,117 | 9,366 | 20,689 | ||
| R | 4,728 | 10,118 | 17,834 | ||
| R | 8,172 | 10,262 | 19,138 | ||
| D | 3,258 | 3,209 | 9,267 | ||
| R | 3,513 | 4,786 | 9,093 | ||
| R | 1,996 | 4,044 | 6,859 | ||
| R | 2,760 | 3,723 | 6,540 | ||
| R | 2,582 | 3,027 | 5,637 | ||
| R | 2,118 | 2,504 | 4,878 | ||
| — | — | — | — | ||
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Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
17.3%
English
14.2%
Irish
13.6%
American
5.9%
Italian
4.7%
Polish
2.1%
French
2.1%
African American
3.6%
Multiple ancestry combinations reported; no single grouping above 1%.
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.
Age distribution by sex
Median age: 41.6 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.
Median household income
2024 inflation-adjusted dollars
$65,604
Williamson County ranks near the middle of US counties.
Williamson County$65,604
Illinois$83,390
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
13.8%
Children face moderate poverty.
Children under 1817.8%
Working age (18–64)12.9%
Seniors (65+)10.5%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
96.7%
speak English only
Spanish1.4%
Asian & Pacific Islander1.0%
Other Indo-European0.8%
Other languages0.1%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 63.4% of residents not counted as adherents by any reporting body.
Williamson County's coalfield heritage once made it a Democratic bedrock, but the region's political realignment over recent decades has produced presidential margins exceeding R+38, among the sharpest swings in downstate Illinois.
The Republican margin in Williamson County reached its widest at forty-one points in 2016. The margin in 2024 was thirty-nine points, in line with the county's deep historical pattern.
Its loyalty is rooted in its place. Median household income of $65,604, a 89% non-Hispanic-white share, and a population of 66,876 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Randolph County and Union County.
Most similar counties
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Williamson County, Illinois — The Long Memory. Akashic Intelligence — The Long Memory. https://akashic.app/county/17199/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More in Illinois
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Frequently asked questions
How did Williamson County, Illinois vote in 2024?
In 2024, Williamson County, Illinois voted Republican by 38.7 points (R+39), carried by the Republican candidate. Out of 33,068 votes cast, 9,890 went Democratic and 22,686 went Republican.
What is Williamson County, Illinois's political archetype?
Akashic classifies Williamson County, Illinois as a "Republican loyalist" county based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the county has voted Democratic 9 times, Republican 25 times, and other 0 times.
When did Williamson County, Illinois last vote Democratic?
The most recent presidential election in which Williamson County, Illinois voted Democratic was 1996.
How many people live in Williamson County, Illinois?
Williamson County, Illinois has a population of 66,876 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Williamson County, Illinois?
Median household income in Williamson County, Illinois is $65,604 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Williamson County, Illinois?
Akashic tracks 38 presidential elections in Williamson County, Illinois from 1876 to 2024. Of those, 9 went Democratic and 25 went Republican. The county's archetype — "Republican loyalist" — captures the overall trajectory of that voting record.