- Lead
- 7,874
- Total
- 53,391
- vs nation
- R+13.3
Illinois 90th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 7,322
- Total
- 56,050
- vs nation
- R+17.5
- Lead
- 7,869
- Total
- 50,683
- vs nation
- R+17.6
- Lead
- 3,866
- Total
- 50,793
- vs nation
- R+11.5
- Lead
- 50
- Total
- 52,685
- vs nation
- R+7.4
- Lead
- 8,625
- Total
- 51,753
- vs nation
- R+14.2
- Lead
- 7,440
- Total
- 46,245
- vs nation
- R+16.6
- Lead
- 5,035
- Total
- 42,628
- vs nation
- R+20.3
Key facts
- 2024 presidential margin
- R+14.7MIT Election Lab
- Population
- 108,5252024 5-year
- Population density
- 200 / sq mi2024 5-year · TIGER/Line
- Land area
- 542 sq miTIGER/Line
- Median household income
- $76,7462024 5-year
- White (non-Hispanic)
- 80.4%2024 5-year
- Black
- 6.1%2024 5-year
- Hispanic / Latino
- 6.6%2024 5-year
- Peak Democratic margin
- D+15.2 in 1912MIT Election Lab
- Peak Republican margin
- R+60.7 in 1920MIT Election Lab
- Most similar
- State House District 89, IL · twin score 91.8
presidential history
Party record book
Illinois 90th State House 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
Lyndon B. Johnson1964
49.9%
20,291 votes · R+0.3 · modeled estimate
Runner-up · Barack Obama, 2008 · 48.8%
Republican
Warren G. Harding1920
77.8%
13,685 votes · R+60.7 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 75.6%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Barack Obama2008
25,736votes
48.8% of the vote · R+0.1 · modeled estimate
Runner-up · Joe Biden, 2020 · 23,630 votes
Republican
Ronald Reagan1984
32,319votes
66.5% of the vote · R+33.7 · modeled estimate
Runner-up · Donald Trump, 2020 · 30,952 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
Woodrow Wilson1912
−4.4pts D vs U.S.
Place D+15.2 · U.S. D+19.5 · a third-party candidate carried the Place · modeled estimate
Runner-up · Barack Obama, 2008 · −7.4 pts
Republican
Warren G. Harding1920
+34.5pts R vs U.S.
Place R+60.7 · U.S. R+26.2 · modeled estimate
Runner-up · Herbert Hoover, 1928 · +34.4 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 | R | 32.2%13,791 | 67.8%28,982 | 42,773 |
| 2020 | R | 44.9%22,460 | 55.1%27,511 | 49,971 |
Illinois House District 90 leans heavily toward Republican presidential candidates, posting a 14.6-point margin in 2024. Its population of roughly 108,000 reflects the mid-sized downstate communities that anchor this corner of the state's legislative map.
Across the recorded series it reached a Democratic high of 15.2 points in 1912 and a Republican high of 60.7 points in 1920. Between 2020 and 2024 the district moved 1.7 points toward the Republican candidate; the 2024 margin was 14.7 points.
A population of 108,525, a 80% non-Hispanic-white share, and a median household income of $76,746 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 89 and State House District 72.
The state-house 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 90th State House District. Akashic. https://akashic.app/sld-lower/17090/. Accessed May 20, 2026. License: CC BY 4.0.