- Lead
- 3,255
- Total
- 41,606
- vs nation
- D+9.3
Illinois 86th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 7,622
- Total
- 45,261
- vs nation
- D+12.4
- Lead
- 8,019
- Total
- 43,025
- vs nation
- D+16.5
- Lead
- 7,221
- Total
- 39,449
- vs nation
- D+14.4
- Lead
- 10,482
- Total
- 40,914
- vs nation
- D+18.3
- Lead
- 2,712
- Total
- 34,873
- vs nation
- D+10.2
- Lead
- 2,777
- Total
- 26,526
- vs nation
- D+9.9
- Lead
- 3,549
- Total
- 20,873
- vs nation
- D+8.5
Key facts
- 2024 presidential margin
- D+7.8MIT Election Lab
- Population
- 108,5722024 5-year
- Population density
- 751 / sq mi2024 5-year · TIGER/Line
- Land area
- 145 sq miTIGER/Line
- Median household income
- $77,9262024 5-year
- White (non-Hispanic)
- 45.0%2024 5-year
- Black
- 16.0%2024 5-year
- Hispanic / Latino
- 34.7%2024 5-year
- Peak Democratic margin
- D+26.2 in 1964MIT Election Lab
- Peak Republican margin
- R+51.7 in 1920MIT Election Lab
- Most similar
- State House District 85, IL · twin score 92.0
presidential history
Party record book
Illinois 86th 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
63.1%
7,951 votes · D+26.2 · modeled estimate
Runner-up · Barack Obama, 2008 · 62.4%
Republican
Warren G. Harding1920
74.1%
2,620 votes · R+51.7 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 64.8%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
25,996votes
57.4% of the vote · D+16.8 · modeled estimate
Runner-up · Barack Obama, 2008 · 25,534 votes
Republican
Donald Trump2024
18,771votes
45.1% of the vote · D+7.8 · modeled estimate
Runner-up · Donald Trump, 2020 · 18,374 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
Al Smith1928
+20.5pts D vs U.S.
Place D+3.0 · U.S. R+17.5 · modeled estimate
Runner-up · Barack Obama, 2008 · +18.3 pts
Republican
Warren G. Harding1920
+25.5pts R vs U.S.
Place R+51.7 · U.S. R+26.2 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · +23.6 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 |
|---|---|---|---|---|
| 2018 | D | 51.3%9,642 | 48.7%9,169 | 18,811 |
Illinois 86th State House District sits in the Upper Midwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 26.2 points in 1964 and a Republican high of 51.7 points in 1920. Between 2020 and 2024 the district moved 9.0 points toward the Republican candidate; the 2024 margin was 7.8 points.
A population of 108,572, a 45% non-Hispanic-white share, and a median household income of $77,926 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 85 and State House District 98.
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 86th State House District. Akashic. https://akashic.app/sld-lower/17086/. Accessed May 20, 2026. License: CC BY 4.0.