Akashic
1892–2024
Akashic
Illinois 31st State Senate District
presidential margin
2008D+17.12012D+8.62016D+16.82020D+22.72024D+18.1
full record · 2008 → 2024
D+18.1
2024
median income$102,203U.S. $80,734 · IL $83,390
median age37.9U.S. 39.1 · IL 39.1
poverty rate8.3%U.S. 12.5% · IL 11.8%
bachelor’s+ (25+)47.7%U.S. 35.6% · IL 37.9%
non-english31.4%U.S. 22.3% · IL 24.1%
race · ethnicity · ancestry
German16.0%
Irish10.1%
Polish7.5%
Mexican21.9%
Puerto Rican2.1%
Honduran0.9%
African American†7.6%
African0.4%
Nigerian0.3%
Asian Indian2.8%
Filipino1.2%
Chinese0.9%
religion

Religious adherence is published only at the county level (U.S. Religion Census). See Lake County.

American Community Survey 2024 5-year (income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024.

Illinois 31st State Senate District

Akashic
Illinois 31st State Senate DistrictHarrisD+18.1
2024
2024 presidential margin for Illinois 31st State Senate DistrictThe boundary of Illinois 31st State Senate District, filled by its 2024 presidential margin (D+18.1), over faint outlines of the counties it is drawn from.Illinois 31st State Senate District · D+18.1
How it voted
Share of the 2024 vote
Kamala Harris ✓Democratic57.7%53,437
Donald TrumpRepublican39.6%36,677
Robert F. Kennedy Jr.Independent2.8%2,571
D+60
R+60
District boundary, filled by its own 2024 D-vs-R margin — precinct detail where available, over the 1 county it's drawn from (shown faint).
The precinct map shows the 2024 presidential vote; the timeline scrubs the district’s overall result across 1892–2024, on its current boundaries.
County-level results (1 county) — table
2024 presidential result by county for Illinois 31st State Senate District — winner and D-vs-R margin.
CountyWinnerMargin
Lake County, ILDemocraticD+20.7
5 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonDemocraticRepublicanOtherMarginTotal
D
57.7%Harris53,437
39.6%Trump36,677
2.8%Kennedy2,571
+18.1%
92,685
D
60.3%Biden60,637
37.6%Trump37,791
2.1%Jorgensen2,147
+22.7%
100,575
D
54.4%Clinton49,698
37.7%Trump34,398
7.9%Johnson7,240
+16.8%
91,336
D
54.3%Obama45,779
45.7%Romney38,556
0.0%
+8.6%
84,335
D
57.9%Obama52,195
40.7%McCain36,751
1.4%Nader1,261
+17.1%
90,207
presidential history
Presidential margin, 2008–2024
Democratic minus Republican, by election
Presidential margin over timeDemocratic-minus-Republican presidential margin from 2008 to 2024. Most recent: +18.1% in 2024.+18.1%DR20082024
Presidential margin over time
YearMargin (D minus R)
2008+17.1%
2012+8.6%
2016+16.8%
2020+22.7%
2024+18.1%
DemocraticRepublican
current representation
Current officeholders
DMary Edly-AllenState Senate · 31

State legislative officeholder from OpenStates nightly current-legislator data.

Source · OpenStates current legislator CSV.

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.

Across the recorded series it reached a Democratic high of 22.7 points in 2020. Between 2020 and 2024 the district moved 4.6 points toward the Republican candidate; the 2024 margin was 18.1 points.

A population of 217,217, a 57% non-Hispanic-white share, and a median household income of $102,203 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 42 and State Senate District 25.

Political twins — state-senate districts

The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.

State Senate District 42
Illinois
95.8twin score
12-yr trend2020–2024 trajectorymedian income
State Senate District 25
Illinois
92.3twin score
2016–2024 trajectorycollege share
State Senate District 30
Illinois
89.7twin score
% Catholicmedian incomecollege share≠ % Asian

Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.

Compare State Senate District 31 with…

All twelve comparisons →

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

counties it covers1
Lake County

Frequently asked questions

How did Illinois 31st State Senate District vote in 2024?
In 2024, Illinois 31st State Senate District voted Democratic by 18.1 points (D+18.1), carried by the Democratic candidate. Out of 92,685 votes cast, 53,437 went Democratic and 36,677 went Republican.
How many people live in Illinois 31st State Senate District?
Illinois 31st State Senate District has a population of 217,217 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Illinois 31st State Senate District?
Median household income in Illinois 31st State Senate District is $102,203 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Illinois 31st State Senate District?
Akashic tracks 5 presidential elections in Illinois 31st State Senate District from 2008 to 2024. Of those, 5 went Democratic and 0 went Republican.