akashic
1876–2024
State House District 21·Illinois

Illinois 21st State House District has voted Democratic in thirteen straight presidential cycles.

One of Illinois's most Republican-leaning state house seats

1876 — 2024·38 elections
IL
Latest
D+42
in 2024
Archetype
Democratic loyalist
since the recent cycles
Population
100,022
2024 ACS

Illinois 21st State House District, Illinois: Democratic loyalist district. In 2024, voted D+42%. Democratic peak: D+53 in 2008.

Key facts

2024 presidential margin
D+42MIT Election Lab
Political archetype
Democratic loyalistAkashic typology
Population
100,0222024 5-year
Median household income
$83,4982024 5-year
White (non-Hispanic)
43.6%2024 5-year
Black
22.2%2024 5-year
Hispanic / Latino
26.8%2024 5-year
Peak Democratic margin
D+53 in 2008MIT Election Lab
Peak Republican margin
R+49 in 1920MIT Election Lab
2024 results by constituent county
1 counties · 1 D · 0 R
R+60
D+60
One cell per constituent county. Ordered by 2024 D-vs-R margin (bluest first). Hover for county-level numbers.
38 presidential elections
Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonMarginDemocraticRepublicanTotal
D
+41.6%
27,94511,26940,132
D
+50.2%
33,31410,77544,884
D
+53.1%
31,1138,74942,084
D
+49.3%
28,7319,56538,889
D
+53.4%
31,4439,41441,256
D
+41.1%
27,78911,53139,557
D
+40.0%
24,71610,31736,015
D
+40.1%
22,2608,90933,327
D
+30.0%
24,11811,68341,434
D
+12.4%
21,81016,95839,108
D
+2.6%
21,47620,37442,091
D
+12.4%
21,70616,53341,751
D
+8.7%
22,79119,06042,651
R
−7.4%
20,52323,82444,606
D
+9.5%
22,80118,53945,099
D
+26.4%
29,67017,28946,959
D
+13.0%
26,60420,45247,197
R
−13.9%
18,87324,96143,946
R
−0.7%
22,63022,94945,705
D
+8.9%
23,48319,60643,349
D
+15.9%
24,61617,84742,583
D
+10.9%
22,54718,11440,819
D
+27.5%
24,18813,53438,785
D
+13.8%
17,74313,32132,122
R
−6.2%
13,82515,67429,728
R
−41.6%
4,36513,29821,495
R
−49.0%
3,81212,26017,239
R
−6.6%
7,3248,41016,405
O
+13.0%
2,5231,4458,286
R
−18.6%
2,9534,4478,012
R
−32.1%
2,0034,4367,584
R
−4.4%
3,5943,9337,742
R
−18.4%
2,9374,2827,327
D
+12.8%
2,7912,1475,044
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Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
9.0%
Irish
8.4%
Polish
7.0%
Italian
4.8%
English
3.6%
American
2.2%
French
0.9%
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: 38.0 in this county, 39.1 nationally
Male
Age
Female
0.7%
85+
1.3%
1.9%
75–84
2.7%
4.3%
65–74
5.1%
5.9%
55–64
6.2%
6.1%
45–54
6.2%
7.0%
35–44
7.0%
7.9%
25–34
8.0%
4.3%
18–24
4.4%
8.0%
5–17
7.7%
2.8%
<5
2.7%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$83,498
State House District 21 ranks near the middle of US counties.
State House District 21$83,498
Illinois$83,390
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
13.5%
Children face moderate poverty.
Children under 1817.9%
Working age (18–64)12.2%
Seniors (65+)14.0%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
64.2%
speak English only
Spanish21.1%
Other Indo-European8.3%
Asian & Pacific Islander4.3%
Other languages2.1%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Catholic & Orthodox
29.6%
Non-Christian
7.7%
Other Christian
6.4%
Baptist
4.8%
Mainline Protestant
2.9%
Pentecostal & Holiness
1.8%
Methodist
1.0%
Source · 2020 US Religion Census. Remaining 45.8% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of R+46.6, this downstate district sits among the most reliably Republican constituencies in Illinois, reflecting the deep partisan divide between rural southern Illinois and the Chicago metropolitan area.

The Democratic margin in Illinois 21st State House District reached its widest at fifty-three points in 2008. The margin in 2024 was forty-two points — still decisive.

Its loyalty is rooted in its place. Median household income of $83,498, a 44% non-Hispanic-white share, and a population of 100,022 together describe a district whose political habits are deeply settled.

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.
State House District 21, Illinois. Akashic. https://akashic.app/sld-lower/17021/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did State House District 21, Illinois vote in 2024?
In 2024, State House District 21, Illinois voted Democratic by 41.6 points (D+42), carried by the Democratic candidate. Out of 40,132 votes cast, 27,945 went Democratic and 11,269 went Republican.
What is State House District 21, Illinois's political archetype?
Akashic classifies State House District 21, Illinois as a "Democratic loyalist" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 22 times, Republican 11 times, and other 1 times.
When did State House District 21, Illinois last vote Republican?
The most recent presidential election in which State House District 21, Illinois voted Republican was 1972.
How many people live in State House District 21, Illinois?
State House District 21, Illinois has a population of 100,022 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State House District 21, Illinois?
Median household income in State House District 21, Illinois is $83,498 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of State House District 21, Illinois?
Akashic tracks 38 presidential elections in State House District 21, Illinois from 1876 to 2024. Of those, 22 went Democratic and 11 went Republican. The district's archetype — "Democratic loyalist" — captures the overall trajectory of that voting record.