- Lead
- 56,431
- Total
- 109,091
- vs nation
- D+53.2
Illinois 9th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 64,801
- Total
- 118,830
- vs nation
- D+50.1
- Lead
- 58,349
- Total
- 108,773
- vs nation
- D+51.6
- Lead
- 50,248
- Total
- 99,359
- vs nation
- D+46.7
- Lead
- 57,623
- Total
- 105,199
- vs nation
- D+47.5
- Lead
- 42,861
- Total
- 100,806
- vs nation
- D+45.0
- Lead
- 38,038
- Total
- 91,302
- vs nation
- D+41.1
- Lead
- 35,235
- Total
- 86,153
- vs nation
- D+32.4
Key facts
- 2024 presidential margin
- D+51.7MIT Election Lab
- Population
- 216,7712024 5-year
- Population density
- 5,516 / sq mi2024 5-year · TIGER/Line
- Land area
- 39.3 sq miTIGER/Line
- Median household income
- $120,3002024 5-year
- White (non-Hispanic)
- 63.5%2024 5-year
- Black
- 8.2%2024 5-year
- Hispanic / Latino
- 9.0%2024 5-year
- Peak Democratic margin
- D+54.8 in 2008MIT Election Lab
- Peak Republican margin
- R+46.9 in 1920MIT Election Lab
- Most similar
- State Senate District 29, IL · twin score 94.0
presidential history
Party record book
Illinois 9th 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
76.7%
80,730 votes · D+54.8 · modeled estimate
Runner-up · Joe Biden, 2020 · 76.4%
Republican
Warren G. Harding1920
69.4%
30,216 votes · R+46.9 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 58.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
90,835votes
76.4% of the vote · D+54.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · 81,684 votes
Republican
Dwight D. Eisenhower1956
62,001votes
56.1% of the vote · R+12.2 · modeled estimate
Runner-up · Richard Nixon, 1972 · 58,715 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
Kamala Harris2024
+53.2pts D vs U.S.
Place D+51.7 · U.S. R+1.5 · modeled estimate
Runner-up · Hillary Clinton, 2016 · +51.6 pts
Republican
Warren G. Harding1920
+20.7pts R vs U.S.
Place R+46.9 · U.S. R+26.2 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · +12.9 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 | 73.1%60,801 | 26.9%22,337 | 83,138 |
Illinois 9th State Senate District sits in the Upper Midwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 54.8 points in 2008 and a Republican high of 46.9 points in 1920. Between 2020 and 2024 the district moved 2.8 points toward the Republican candidate; the 2024 margin was 51.7 points.
A population of 216,771, a 64% non-Hispanic-white share, and a median household income of $120,300 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 29 and State Senate District 6.
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 9th State Senate District. Akashic. https://akashic.app/sld-upper/17009/. Accessed May 20, 2026. License: CC BY 4.0.