- Lead
- 3,653
- Total
- 9,242
- vs nation
- D+41.0
Delaware 31st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 3,939
- Total
- 10,205
- vs nation
- D+34.1
- Lead
- 2,588
- Total
- 8,878
- vs nation
- D+27.1
- Lead
- 3,328
- Total
- 8,487
- vs nation
- D+35.4
- Lead
- 3,670
- Total
- 8,404
- vs nation
- D+36.4
- Lead
- 1,429
- Total
- 6,474
- vs nation
- D+24.5
- Lead
- 1,846
- Total
- 5,775
- vs nation
- D+31.4
- Lead
- 1,764
- Total
- 4,886
- vs nation
- D+27.6
Key facts
- 2024 presidential margin
- D+39.5MIT Election Lab
- Population
- 25,0862024 5-year
- Population density
- 1,991 / sq mi2024 5-year · TIGER/Line
- Land area
- 12.6 sq miTIGER/Line
- Median household income
- $59,0642024 5-year
- White (non-Hispanic)
- 40.4%2024 5-year
- Black
- 41.3%2024 5-year
- Hispanic / Latino
- 7.1%2024 5-year
- Peak Democratic margin
- D+62.5 in 1884MIT Election Lab
- Most similar
- State Representative District 32, DE · twin score 96.4
presidential history
Party record book
Delaware 31st 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
Grover Cleveland1884
81.2%
658 votes · D+62.5 · modeled estimate
Runner-up · Samuel J. Tilden, 1876 · 79.4%
Republican
Ronald Reagan1984
46.3%
1,680 votes · D+7.1 · modeled estimate
Runner-up · Richard Nixon, 1972 · 43.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
6,982votes
68.4% of the vote · D+38.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 6,367 votes
Republican
Donald Trump2020
3,043votes
29.8% of the vote · D+38.6 · modeled estimate
Runner-up · Donald Trump, 2016 · 2,885 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
James M. Cox1920
+64.8pts D vs U.S.
Place D+38.7 · U.S. R+26.2 · modeled estimate
Runner-up · John W. Davis, 1924 · +60.1 pts
Republican
George H. W. Bush1992
−21.0pts R vs U.S.
Place D+26.5 · U.S. D+5.6 · modeled estimate
Runner-up · Richard Nixon, 1968 · −21.2 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 |
|---|---|---|---|---|
| 2020 | D | 51.1%5,668 | 46.5%5,155 | 11,091 |
| 2018 | D | 57.5%4,434 | 42.5%3,284 | 7,718 |
With a 2024 presidential margin of D+39.5, this Wilmington-area district ranks among the most reliably blue constituencies in the state, reflecting the dense urban core and majority-minority demographics common to Delaware's First State capital region.
Across the recorded series it reached a Democratic high of 62.5 points in 1884. Between 2020 and 2024 the district moved 0.9 points toward the Democratic candidate; the 2024 margin was 39.5 points.
A population of 25,086, a 40% non-Hispanic-white share, and a median household income of $59,064 describe the district. The district's voting pattern over the last decade is most similar to that of State Representative District 32 and State House District 162.
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 →
Delaware 31st State House District. Akashic. https://akashic.app/sld-lower/10031/. Accessed May 20, 2026. License: CC BY 4.0.