- Lead
- 11,471
- Total
- 99,894
- vs nation
- D+13.0
Illinois 23rd State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 19,804
- Total
- 106,971
- vs nation
- D+14.1
- Lead
- 15,412
- Total
- 94,079
- vs nation
- D+14.3
- Lead
- 2,820
- Total
- 87,678
- vs nation
- R+0.6
- Lead
- 11,754
- Total
- 91,516
- vs nation
- D+5.6
- Lead
- 6,530
- Total
- 87,825
- vs nation
- R+5.0
- Lead
- 8,826
- Total
- 79,087
- vs nation
- R+11.7
- Lead
- 6,246
- Total
- 70,772
- vs nation
- R+17.3
Key facts
- 2024 presidential margin
- D+11.5MIT Election Lab
- Population
- 217,1472024 5-year
- Population density
- 3,843 / sq mi2024 5-year · TIGER/Line
- Land area
- 56.5 sq miTIGER/Line
- Median household income
- $105,3012024 5-year
- White (non-Hispanic)
- 59.6%2024 5-year
- Black
- 4.5%2024 5-year
- Hispanic / Latino
- 19.1%2024 5-year
- Peak Democratic margin
- D+18.5 in 2020MIT Election Lab
- Peak Republican margin
- R+69.6 in 1920MIT Election Lab
- Most similar
- State Senate District 24, IL · twin score 93.8
presidential history
Party record book
Illinois 23rd State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Joe Biden2020
57.9%
61,910 votes · D+18.5 · modeled estimate
Runner-up · Barack Obama, 2008 · 55.8%
Republican
Warren G. Harding1920
82.6%
3,394 votes · R+69.6 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1956 · 79.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
61,910votes
57.9% of the vote · D+18.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · 53,775 votes
Republican
Ronald Reagan1984
49,147votes
74.8% of the vote · R+50.1 · modeled estimate
Runner-up · George H. W. Bush, 1988 · 46,967 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Hillary Clinton2016
+14.3pts D vs U.S.
Place D+16.4 · U.S. D+2.1 · modeled estimate
Runner-up · Joe Biden, 2020 · +14.1 pts
Republican
Thomas E. Dewey1948
+49.7pts R vs U.S.
Place R+45.2 · U.S. D+4.5 · modeled estimate
Runner-up · Wendell Willkie, 1940 · +44.2 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
| Year | Vote lead | Democratic | Republican | Total |
|---|---|---|---|---|
| 2024 | D | 56.4%59,204 | 43.6%45,701 | 104,905 |
| 2020 | D | 64.4%63,549 | 35.6%35,076 | 98,625 |
Illinois 23rd State Senate District sits in the Upper Midwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 18.5 points in 2020 and a Republican high of 69.6 points in 1920. Between 2020 and 2024 the district moved 7.0 points toward the Republican candidate; the 2024 margin was 11.5 points.
A population of 217,147, a 60% non-Hispanic-white share, and a median household income of $105,301 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 24 and State Senate District 21.
The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
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.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
Illinois 23rd State Senate District. Akashic. https://akashic.app/sld-upper/17023/. Accessed May 20, 2026. License: CC BY 4.0.