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Illinois State Senate District 40

Illinois State Senate District 40

Illinois · Latest: 2024↓ R+8.5 vs 2020

Competitive — shifted 8.5pp toward Republicans in 2024 — 217K residents

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Illinois State Senate District 40 is a state senate district that has a population of 217,318. In the 2024 presidential election, it voted Democratic with a margin of D+0.3. Akashic Edge tracks 5 presidential elections here, dating back to 2008.

Illinois State Senate District 40 Presidential Election Results, 2008–2024
YearDem %Rep %MarginSwing
202449.2%48.8%D+0.3R+8.5
2020*53.4%44.6%D+8.8R+0.7
2016*51.9%42.4%D+9.5R+6.3
2012*57.9%42.1%D+15.8R+5.4
2008*59.8%38.6%D+21.2—

* Pre-2022 results projected onto current district boundaries. Actual boundaries at the time of the election may have differed.

Political Identity

What defines IL-SD-40?

IL-SD-40 has been trending Republican — 15pp redder over the last 4 presidential cycles. It has a plurality-minority electorate (45% nonwhite) where demographic change is reshaping the political map.

Similarity Explorer

Similar state senate districts

Nearest neighbors matched on the same place-page feature set used across the dossier system.
8 visible matches
Historian Query

Ask the Historian

Explore IL-SD-40's political evolution with the Historian
Automated Readout

Key Insights

High-confidence patterns distilled from this geography's election history.
  • Has voted Democratic in the last 5 presidential elections
  • The 2024 election was decided by just 0.3 points — razor-thin
  • Shifted 15.5 points toward Republicans over the last 4 elections
Race & Ancestry

Who Lives Here

A race-first Census view with ancestry expansion where source coverage is strong enough to support detail.
IL-SD-40Census ACS 2024
Census race profile
Major Census race and ethnicity groups shown as a share of total population.
Expand rows for ancestry detail
White (Non-Hispanic) 54.9%Black 26.3%Hispanic 14.3%Multiracial 3.1%Asian 0.9%Native American 0.5%
GroupIL-SD-40StateNational
White (Non-Hispanic)
54.9%58.1%57.4%
Black / African American
26.3%13.6%12.2%
Hispanic / Latino
14.3%18.8%19.3%
Multiracial / Other
3.1%2.9%4.0%
Asian
0.9%6.0%6.0%
Native American / Alaska Native
0.5%0.6%0.9%
Method notes

Census treats race and Hispanic/Latino origin as separate questions. Race categories other than Hispanic reflect total populations (small Hispanic overlap in Black, Asian, AIAN, NHPI). “Multiracial / Other” is derived as a non-overlapping remainder.

Detailed ancestry data unavailable for this geography.

Who lives in Illinois State Senate District 40? 217,318 residents as of the 2020 Census.

Demographic Comparison

Demographics

Read this geography's profile in three layers: local, state (where available), and national baseline.
IL-SD-40 vs Illinois vs National217K residents
Population & electorate

Scale, voting-age share, and this geography's footprint inside the national electorate.

Total population
Local vs state vs U.S.
217K
local
217KState 12.7MNational 334.9M
Share of U.S. population
Local vs state vs U.S.
0.06%
local
0.06%National 100%
Voting-age population
Local vs state vs U.S.
76.1%
local
76.1%State 75.9%National 75.7%
Economic profile

Income, attainment, and ownership indicators that often shape coalition structure and turnout behavior.

Median household income
Local vs state vs U.S.
N/A
local
N/AState $84,845National $83,960
Poverty rate
Local vs state vs U.S.
N/A
local
N/AState 11.8%National 12.5%
College degree
Local vs state vs U.S.
N/A
local
N/AState 37.9%National 35.6%
Homeownership
Local vs state vs U.S.
N/A
local
N/AState 67.1%National 65.2%
Community profile

Age structure, language use, and nativity signals that explain how this geography differs from state and nation.

Median age
Local vs state vs U.S.
N/A
local
N/AState 39.1 yrsNational 39.1 yrs
Age 18–29
Local vs state vs U.S.
N/A
local
N/AState 15.8%National 15.7%
Age 65+
Local vs state vs U.S.
N/A
local
N/AState 17.0%National 17.0%
Foreign born
Local vs state vs U.S.
N/A
local
N/AState 14.7%National 14.1%
Non-English at home
Local vs state vs U.S.
N/A
local
N/AState 24.0%National 22.2%
English only
Local vs state vs U.S.
N/A
local
N/AState 76.0%National 77.8%
Voter Turnout

Turnout in IL-SD-40

Estimated using 2020 Census voting-age population.
2024 Turnout
57.2%
vs Previous
-65.2pp
Voting-Age Pop
165,372
History
2008–2024
Competitiveness

How competitive is IL-SD-40?

Lean DAvg margin: D+6.2 (last 3 elections)
2008
D+21.2
2012
D+15.8
2016
D+9.5
2020
D+8.8
2024
D+0.3
Elasticity
20.8pp
margin range
Party Flips
0
last 30 years
5-Elec Avg
D+11.1

Other Illinois State Senate Districts

58 total
NameMargin ↓
IL-SD-07D+77.1
IL-SD-13D+72.6
IL-SD-03D+68.5
IL-SD-05D+67.0
IL-SD-06D+67.0
IL-SD-20D+62.7
IL-SD-17D+60.2
IL-SD-02D+57.1
IL-SD-04D+53.6
IL-SD-09D+52.2
IL-SD-15D+46.7
IL-SD-16D+46.0
IL-SD-39D+44.6
IL-SD-14D+38.0
IL-SD-12D+38.0
IL-SD-29D+33.4
IL-SD-30D+33.2
IL-SD-01D+30.1
IL-SD-52D+26.8
IL-SD-21D+22.0
IL-SD-42D+21.0
IL-SD-11D+18.1
IL-SD-31D+18.1
IL-SD-22D+18.0
IL-SD-08D+17.8
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