akashic
1876–2024
State Senate District 31·Illinois

Illinois 31st State Senate District changed direction in the last decade — D+21 in 2024.

One of Illinois's most Democratic-leaning state senate seats

1876 — 2024·38 elections
IL
Latest
D+21
in 2024
Archetype
Recent convert
since the recent cycles
Population
222,286
2024 ACS

Illinois 31st State Senate District, Illinois: Recent convert district. In 2024, voted D+21%. Republican peak: R+70 in 1920.

Key facts

2024 presidential margin
D+21MIT Election Lab
Political archetype
Recent convertAkashic typology
Population
222,2862024 5-year
Median household income
$110,4162024 5-year
White (non-Hispanic)
61.2%2024 5-year
Black
6.7%2024 5-year
Hispanic / Latino
24.9%2024 5-year
Peak Democratic margin
D+24 in 2020MIT Election Lab
Peak Republican margin
R+70 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
+20.7%
57,46637,47296,765
D
+24.0%
63,50038,466104,471
D
+20.2%
53,24934,16294,464
D
+8.3%
47,85340,38689,476
D
+19.6%
55,16336,89493,090
R
−1.7%
41,81443,28685,679
R
−2.4%
35,80937,65575,368
D
+0.1%
29,04228,99163,728
R
−7.7%
25,42530,81269,711
R
−27.7%
20,02035,51655,907
R
−37.2%
16,79036,85053,912
R
−29.2%
15,02829,98751,307
R
−22.6%
17,97128,70547,585
R
−31.9%
14,75728,64943,513
R
−21.0%
13,51021,47437,940
D
+3.2%
19,54018,31337,866
R
−18.2%
14,60921,10435,760
R
−34.8%
10,04620,78430,870
R
−25.8%
10,06917,09527,210
R
−27.7%
6,90712,28019,411
R
−16.7%
7,92211,10319,081
R
−20.9%
7,77011,90219,751
R
−5.6%
7,6338,57416,705
R
−6.1%
6,5797,46814,666
R
−36.8%
3,8138,34512,321
R
−67.2%
6255,6737,516
R
−70.1%
7224,8905,943
R
−38.7%
1,6954,0165,991
O
+2.5%
7586793,147
R
−44.0%
7051,9892,919
R
−58.6%
4952,0652,678
R
−38.2%
6961,5982,362
R
−46.9%
5531,5652,159
R
−18.9%
6119131,596
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Demographics

Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
15.8%
Irish
10.0%
Polish
7.4%
English
6.4%
Italian
6.0%
American
3.3%
French
1.4%
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: 39.1 in this county, 39.1 nationally
Male
Age
Female
0.7%
85+
1.1%
2.0%
75–84
2.5%
4.6%
65–74
4.9%
6.6%
55–64
6.7%
6.6%
45–54
6.6%
6.5%
35–44
6.4%
5.9%
25–34
5.5%
5.6%
18–24
4.6%
9.2%
5–17
8.8%
2.7%
<5
2.6%
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$110,416
State Senate District 31 ranks near the middle of US counties.
State Senate District 31$110,416
Illinois$83,390
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
8.3%
Child poverty is below the national average.
Children under 1811.5%
Working age (18–64)7.2%
Seniors (65+)8.8%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
68.6%
speak English only
Spanish19.0%
Other Indo-European7.0%
Asian & Pacific Islander4.9%
Other languages0.6%
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Catholic & Orthodox
31.4%
Other Christian
7.2%
Non-Christian
5.4%
Mainline Protestant
4.0%
Baptist
1.7%
Methodist
0.8%
Pentecostal & Holiness
0.7%
Source · 2020 US Religion Census. Remaining 48.8% of residents not counted as adherents by any reporting body.

With a 2024 presidential margin of D+41.5, this district ranks among the most lopsided in the state, reflecting a dense, heavily urbanized constituency where statewide and legislative contests rarely generate competitive general-election races.

The 2008 election was the turning point, when the Democratic candidate carried the district by twenty points. The 2024 margin was twenty-one points, in line with the district's new direction.

The demographics suggest why. A population of 222,286, a 61% non-Hispanic-white share, and a median household income of $110,416 situate the district in the broader realignment patterns of recent cycles.

Compare State Senate District 31 with…

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Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
State Senate District 31, Illinois. Akashic. https://akashic.app/sld-upper/17031/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0

Frequently asked questions

How did State Senate District 31, Illinois vote in 2024?
In 2024, State Senate District 31, Illinois voted Democratic by 20.7 points (D+21), carried by the Democratic candidate. Out of 96,765 votes cast, 57,466 went Democratic and 37,472 went Republican.
What is State Senate District 31, Illinois's political archetype?
Akashic classifies State Senate District 31, Illinois as a "Recent convert" district based on its long-arc presidential voting pattern. Across 38 elections in the dataset, the district has voted Democratic 7 times, Republican 26 times, and other 1 times.
When did State Senate District 31, Illinois last vote Republican?
The most recent presidential election in which State Senate District 31, Illinois voted Republican was 2004.
How many people live in State Senate District 31, Illinois?
State Senate District 31, Illinois has a population of 222,286 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in State Senate District 31, Illinois?
Median household income in State Senate District 31, Illinois is $110,416 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of State Senate District 31, Illinois?
Akashic tracks 38 presidential elections in State Senate District 31, Illinois from 1876 to 2024. Of those, 7 went Democratic and 26 went Republican. The district's archetype — "Recent convert" — captures the overall trajectory of that voting record.