- Lead
- 11,874
- Total
- 25,440
- vs nation
- D+48.1
Delaware 1st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 12,868
- Total
- 26,518
- vs nation
- D+44.1
- Lead
- 9,804
- Total
- 24,577
- vs nation
- D+37.8
- Lead
- 10,512
- Total
- 23,772
- vs nation
- D+40.4
- Lead
- 12,296
- Total
- 24,392
- vs nation
- D+43.1
- Lead
- 7,442
- Total
- 22,528
- vs nation
- D+35.5
- Lead
- 6,747
- Total
- 20,021
- vs nation
- D+33.2
- Lead
- 5,218
- Total
- 16,989
- vs nation
- D+22.2
Key facts
- 2024 presidential margin
- D+46.7MIT Election Lab
- Population
- 44,7082024 5-year
- Population density
- 3,466 / sq mi2024 5-year · TIGER/Line
- Land area
- 12.9 sq miTIGER/Line
- Median household income
- $85,4542024 5-year
- White (non-Hispanic)
- 64.6%2024 5-year
- Black
- 22.0%2024 5-year
- Hispanic / Latino
- 5.2%2024 5-year
- Peak Democratic margin
- D+50.4 in 2008MIT Election Lab
- Peak Republican margin
- R+24.2 in 1928MIT Election Lab
- Most similar
- State Senate District 5, DE · twin score 95.3
presidential history
Party record book
Delaware 1st State Senate 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
74.6%
18,197 votes · D+50.4 · modeled estimate
Runner-up · Joe Biden, 2020 · 73.5%
Republican
Herbert Hoover1928
61.9%
3,758 votes · R+24.2 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 54.8%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
19,484votes
73.5% of the vote · D+48.5 · modeled estimate
Runner-up · Kamala Harris, 2024 · 18,455 votes
Republican
Ronald Reagan1984
8,095votes
50.9% of the vote · R+2.0 · modeled estimate
Runner-up · Richard Nixon, 1972 · 7,960 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
+48.1pts D vs U.S.
Place D+46.7 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +44.1 pts
Republican
Herbert Hoover1932
+15.2pts R vs U.S.
Place D+2.6 · U.S. D+17.8 · modeled estimate
Runner-up · Herbert Hoover, 1928 · +6.8 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.
Anchoring the top of New Castle County, this district has trended toward single-digit presidential margins, making it one of Delaware's more closely contested state senate seats despite the state's overall Democratic lean.
Across the recorded series it reached a Democratic high of 50.4 points in 2008 and a Republican high of 24.2 points in 1928. Between 2020 and 2024 the district moved 1.9 points toward the Republican candidate; the 2024 margin was 46.7 points.
A population of 44,708, a 65% non-Hispanic-white share, and a median household income of $85,454 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 5 and State Senate District 31.
The state-senate 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 1st State Senate District. Akashic. https://akashic.app/sld-upper/10001/. Accessed May 20, 2026. License: CC BY 4.0.