- Lead
- 17,153
- Total
- 57,673
- vs nation
- D+31.2
Illinois 1st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 33,205
- Total
- 65,563
- vs nation
- D+46.2
- Lead
- 35,054
- Total
- 62,481
- vs nation
- D+54.0
- Lead
- 30,482
- Total
- 56,982
- vs nation
- D+49.6
- Lead
- 34,601
- Total
- 60,127
- vs nation
- D+50.3
- Lead
- 26,049
- Total
- 58,095
- vs nation
- D+47.3
- Lead
- 23,251
- Total
- 52,055
- vs nation
- D+44.1
- Lead
- 21,546
- Total
- 49,086
- vs nation
- D+35.4
Key facts
- 2024 presidential margin
- D+29.7MIT Election Lab
- Population
- 217,0502024 5-year
- Population density
- 8,823 / sq mi2024 5-year · TIGER/Line
- Land area
- 24.6 sq miTIGER/Line
- Median household income
- $72,7902024 5-year
- White (non-Hispanic)
- 18.4%2024 5-year
- Black
- 4.5%2024 5-year
- Hispanic / Latino
- 73.7%2024 5-year
- Peak Democratic margin
- D+57.5 in 2008MIT Election Lab
- Peak Republican margin
- R+45.8 in 1920MIT Election Lab
- Most similar
- State Senate District 11, IL · twin score 98.8
presidential history
Party record book
Illinois 1st 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
Barack Obama2008
78.6%
47,270 votes · D+57.5 · modeled estimate
Runner-up · Barack Obama, 2012 · 76.3%
Republican
Warren G. Harding1920
69.9%
16,784 votes · R+45.8 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 58.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
48,765votes
74.4% of the vote · D+50.6 · modeled estimate
Runner-up · Barack Obama, 2008 · 47,270 votes
Republican
Dwight D. Eisenhower1956
34,649votes
54.8% of the vote · R+9.7 · modeled estimate
Runner-up · Richard Nixon, 1972 · 32,676 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
+54.0pts D vs U.S.
Place D+56.1 · U.S. D+2.1 · modeled estimate
Runner-up · Barack Obama, 2008 · +50.3 pts
Republican
Warren G. Harding1920
+19.6pts R vs U.S.
Place R+45.8 · U.S. R+26.2 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · +12.2 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Illinois 1st State Senate District sits in the Upper Midwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 57.5 points in 2008 and a Republican high of 45.8 points in 1920. Between 2020 and 2024 the district moved 20.9 points toward the Republican candidate; the 2024 margin was 29.7 points.
A population of 217,050, a 18% non-Hispanic-white share, and a median household income of $72,790 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 11 and State Senate District 12.
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 1st State Senate District. Akashic. https://akashic.app/sld-upper/17001/. Accessed May 20, 2026. License: CC BY 4.0.