- Lead
- 12,766
- Total
- 59,716
- vs nation
- D+22.8
Illinois 81st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 14,752
- Total
- 63,561
- vs nation
- D+18.8
- Lead
- 9,870
- Total
- 55,826
- vs nation
- D+15.6
- Lead
- 2,458
- Total
- 51,425
- vs nation
- D+0.9
- Lead
- 7,760
- Total
- 53,889
- vs nation
- D+7.1
- Lead
- 3,120
- Total
- 51,420
- vs nation
- R+3.6
- Lead
- 4,535
- Total
- 46,194
- vs nation
- R+10.3
- Lead
- 3,082
- Total
- 41,590
- vs nation
- R+15.9
Key facts
- 2024 presidential margin
- D+21.4MIT Election Lab
- Population
- 108,4892024 5-year
- Population density
- 3,628 / sq mi2024 5-year · TIGER/Line
- Land area
- 29.9 sq miTIGER/Line
- Median household income
- $120,2542024 5-year
- White (non-Hispanic)
- 71.5%2024 5-year
- Black
- 4.4%2024 5-year
- Hispanic / Latino
- 8.0%2024 5-year
- Peak Democratic margin
- D+23.2 in 2020MIT Election Lab
- Peak Republican margin
- R+63.9 in 1920MIT Election Lab
- Most similar
- State House District 42, IL · twin score 98.9
presidential history
Party record book
Illinois 81st 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
Joe Biden2020
60.3%
38,344 votes · D+23.2 · modeled estimate
Runner-up · Kamala Harris, 2024 · 59.3%
Republican
Warren G. Harding1920
79.3%
1,540 votes · R+63.9 · modeled estimate
Runner-up · Dwight D. Eisenhower, 1956 · 78.6%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
38,344votes
60.3% of the vote · D+23.2 · modeled estimate
Runner-up · Kamala Harris, 2024 · 35,438 votes
Republican
Ronald Reagan1984
28,025votes
74.3% of the vote · R+49.2 · modeled estimate
Runner-up · George W. Bush, 2004 · 27,015 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
+22.8pts D vs U.S.
Place D+21.4 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +18.8 pts
Republican
Thomas E. Dewey1948
+50.0pts R vs U.S.
Place R+45.5 · U.S. D+4.5 · modeled estimate
Runner-up · Wendell Willkie, 1940 · +43.1 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 | 56.2%29,567 | 43.8%22,997 | 52,564 |
| 2020 | D | 64.4%32,116 | 35.6%17,740 | 49,856 |
Illinois 81st State House District sits in the Upper Midwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 23.2 points in 2020 and a Republican high of 63.9 points in 1920. Between 2020 and 2024 the district moved 1.8 points toward the Republican candidate; the 2024 margin was 21.4 points.
A population of 108,489, a 72% non-Hispanic-white share, and a median household income of $120,254 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 42 and State House District 45.
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 81st State House District. Akashic. https://akashic.app/sld-lower/17081/. Accessed May 20, 2026. License: CC BY 4.0.