- Lead
- 2,984
- Total
- 45,633
- vs nation
- D+8.0
Illinois 55th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 7,913
- Total
- 49,034
- vs nation
- D+11.7
- Lead
- 9,132
- Total
- 43,831
- vs nation
- D+18.7
- Lead
- 5,609
- Total
- 41,687
- vs nation
- D+9.6
- Lead
- 7,989
- Total
- 43,126
- vs nation
- D+11.3
- Lead
- 1,273
- Total
- 44,001
- vs nation
- D+5.4
- Lead
- 1,045
- Total
- 39,869
- vs nation
- D+2.1
- Lead
- 1,591
- Total
- 36,975
- vs nation
- R+4.2
Key facts
- 2024 presidential margin
- D+6.5MIT Election Lab
- Population
- 108,6862024 5-year
- Population density
- 6,836 / sq mi2024 5-year · TIGER/Line
- Land area
- 15.9 sq miTIGER/Line
- Median household income
- $98,3422024 5-year
- White (non-Hispanic)
- 63.1%2024 5-year
- Black
- 2.7%2024 5-year
- Hispanic / Latino
- 13.5%2024 5-year
- Peak Democratic margin
- D+20.8 in 2016MIT Election Lab
- Peak Republican margin
- R+72.4 in 1920MIT Election Lab
- Most similar
- State House District 56, IL · twin score 96.8
presidential history
Party record book
Illinois 55th 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
Barack Obama2008
58.8%
25,358 votes · D+18.5 · modeled estimate
Runner-up · Hillary Clinton, 2016 · 57.4%
Republican
Warren G. Harding1920
83.9%
22,568 votes · R+72.4 · modeled estimate
Runner-up · William McKinley, 1896 · 75.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
28,087votes
57.3% of the vote · D+16.1 · modeled estimate
Runner-up · Barack Obama, 2008 · 25,358 votes
Republican
Dwight D. Eisenhower1956
45,821votes
75.0% of the vote · R+50.1 · modeled estimate
Runner-up · Richard Nixon, 1972 · 43,611 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
+18.7pts D vs U.S.
Place D+20.8 · U.S. D+2.1 · modeled estimate
Runner-up · Joe Biden, 2020 · +11.7 pts
Republican
Warren G. Harding1920
+46.2pts R vs U.S.
Place R+72.4 · U.S. R+26.2 · modeled estimate
Runner-up · William McKinley, 1896 · +46.1 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%30,485 | 26.9%11,199 | 41,684 |
Illinois 55th State House District sits in the Upper Midwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 20.8 points in 2016 and a Republican high of 72.4 points in 1920. Between 2020 and 2024 the district moved 9.6 points toward the Republican candidate; the 2024 margin was 6.5 points.
A population of 108,686, a 63% non-Hispanic-white share, and a median household income of $98,342 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 56 and State House District 15.
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 55th State House District. Akashic. https://akashic.app/sld-lower/17055/. Accessed May 20, 2026. License: CC BY 4.0.