Akashic
1892–2024
Akashic
Illinois 40th State Senate District
presidential margin
2008D+21.22012D+15.82016D+9.52020D+7.12024D+0.3
full record · 2008 → 2024
D+0.3
2024
median income$75,271U.S. $80,734 · IL $83,390
median age38.3U.S. 39.1 · IL 39.1
poverty rate13.1%U.S. 12.5% · IL 11.8%
bachelor’s+ (25+)36.5%U.S. 35.6% · IL 37.9%
non-english24.0%U.S. 22.3% · IL 24.1%
race · ethnicity · ancestry
German15.7%
Irish12.0%
Polish9.3%
African American†20.4%
African4.4%
Nigerian0.7%
Mexican11.5%
Puerto Rican1.0%
Guatemalan0.2%
religion

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

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

Illinois 40th State Senate District

Akashic
Illinois 40th State Senate DistrictHarrisD+0.3
2024
2024 presidential margin for Illinois 40th State Senate DistrictThe boundary of Illinois 40th State Senate District, filled by its 2024 presidential margin (D+0.3), over faint outlines of the counties it is drawn from.Illinois 40th State Senate District · D+0.3
How it voted
Share of the 2024 vote
Kamala Harris ✓Democratic49.2%46,522
Donald TrumpRepublican48.8%46,213
Robert F. Kennedy Jr.Independent2.0%1,888
D+60
R+60
District boundary, filled by its own 2024 D-vs-R margin — precinct detail where available, over the 4 counties 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 (4 counties) — table
2024 presidential result by county for Illinois 40th State Senate District — winner and D-vs-R margin.
CountyWinnerMargin
Cook County, ILDemocraticD+41.6
Grundy County, ILRepublicanR+29.5
Kankakee County, ILRepublicanR+20.8
Will County, ILDemocraticD+1.6
5 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024).
YearWonDemocraticRepublicanOtherMarginTotal
D
49.2%Harris46,522
48.8%Trump46,213
2.0%Kennedy1,888
+0.3%
94,623
D
52.6%Biden52,641
45.6%Trump45,576
1.8%Jorgensen1,791
+7.1%
100,008
D
51.9%Clinton48,283
42.4%Trump39,410
5.8%Johnson5,355
+9.5%
93,048
D
57.9%Obama51,371
42.1%Romney37,368
0.0%
+15.8%
88,739
D
59.8%Obama56,516
38.6%McCain36,515
1.6%Nader1,532
+21.2%
94,563
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: +0.3% in 2024.+0.3%DR20082024
Presidential margin over time
YearMargin (D minus R)
2008+21.2%
2012+15.8%
2016+9.5%
2020+7.1%
2024+0.3%
DemocraticRepublican
current representation
Current officeholders
DPatrick JoyceState Senate · 40

State legislative officeholder from OpenStates nightly current-legislator data.

Source · OpenStates current legislator CSV.

With a D+64.3 margin in 2024, this Chicago-area district ranks among the most heavily concentrated Democratic-voting state senate districts in Illinois, reflecting dense urban population patterns that consistently produce outsized partisan differentials.

Across the recorded series it reached a Democratic high of 21.2 points in 2008. Between 2020 and 2024 the district moved 6.7 points toward the Republican candidate; the 2024 margin was 0.3 points.

A population of 217,318, a 58% non-Hispanic-white share, and a median household income of $75,271 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 19 and State Senate District 43.

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 19
Illinois
87.3twin score
2008–2012 trajectoryPolish ancestry% Black
State Senate District 43
Illinois
84.2twin score
Polish ancestry2008–2012 trajectoryelasticity≠ % Latino
State Senate District 18
Illinois
83.7twin score
2008–2012 trajectoryPolish ancestrypopulation scale

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 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.
Illinois 40th State Senate District. Akashic. https://akashic.app/sld-upper/17040/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Illinois at the ballot boxAll elections →
Presidentcounty detail2024US Senatestatewide2022Governorstate + county2022US Houseall districts2024

Places within Illinois 40th State Senate District

counties it covers2
Kankakee CountyWill County

Frequently asked questions

How did Illinois 40th State Senate District vote in 2024?
In 2024, Illinois 40th State Senate District voted a near-tie (D+0.3), carried by the Democratic candidate. Out of 94,623 votes cast, 46,522 went Democratic and 46,213 went Republican.
How many people live in Illinois 40th State Senate District?
Illinois 40th State Senate District has a population of 217,318 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Illinois 40th State Senate District?
Median household income in Illinois 40th State Senate District is $75,271 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Illinois 40th State Senate District?
Akashic tracks 5 presidential elections in Illinois 40th State Senate District from 2008 to 2024. Of those, 5 went Democratic and 0 went Republican.