- Lead
- 6,963
- Total
- 25,136
- vs nation
- R+26.2
Delaware 15th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 6,272
- Total
- 23,863
- vs nation
- R+30.7
- Lead
- 6,695
- Total
- 20,231
- vs nation
- R+35.2
- Lead
- 4,629
- Total
- 18,156
- vs nation
- R+29.4
- Lead
- 3,657
- Total
- 17,384
- vs nation
- R+28.3
- Lead
- 6,550
- Total
- 15,633
- vs nation
- R+39.4
- Lead
- 4,155
- Total
- 13,030
- vs nation
- R+32.4
- Lead
- 2,106
- Total
- 10,315
- vs nation
- R+28.9
Key facts
- 2024 presidential margin
- R+27.7MIT Election Lab
- Population
- 46,9482024 5-year
- Population density
- 149 / sq mi2024 5-year · TIGER/Line
- Land area
- 315 sq miTIGER/Line
- Median household income
- $75,9612024 5-year
- White (non-Hispanic)
- 75.4%2024 5-year
- Black
- 11.8%2024 5-year
- Hispanic / Latino
- 5.0%2024 5-year
- Peak Republican margin
- R+55.0 in 1984MIT Election Lab
- Most similar
- State Senate District 21, DE · twin score 91.1
presidential history
Party record book
Delaware 15th 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
Grover Cleveland1884
47.7%
693 votes · R+4.7 · modeled estimate
Runner-up · Samuel J. Tilden, 1876 · 45.9%
Republican
Ronald Reagan1984
77.4%
7,534 votes · R+55.0 · modeled estimate
Runner-up · Richard Nixon, 1972 · 75.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Kamala Harris2024
8,876votes
35.3% of the vote · R+27.7 · modeled estimate
Runner-up · Joe Biden, 2020 · 8,614 votes
Republican
Donald Trump2024
15,839votes
63.0% of the vote · R+27.7 · modeled estimate
Runner-up · Donald Trump, 2020 · 14,886 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
−0.5pts D vs U.S.
Place R+26.7 · U.S. R+26.2 · modeled estimate
Runner-up · John W. Davis, 1924 · −6.2 pts
Republican
George H. W. Bush1988
+40.7pts R vs U.S.
Place R+48.4 · U.S. R+7.7 · modeled estimate
Runner-up · George W. Bush, 2004 · +39.4 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.
Delaware 15th State Senate District sits in the Mid-Atlantic. In 2024 it voted Republican.
Across the recorded series it reached a Republican high of 55.0 points in 1984. Between 2020 and 2024 the district moved 1.4 points toward the Republican candidate; the 2024 margin was 27.7 points.
A population of 46,948, a 75% non-Hispanic-white share, and a median household income of $75,961 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 21 and State Senate District 15.
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 15th State Senate District. Akashic. https://akashic.app/sld-upper/10015/. Accessed May 20, 2026. License: CC BY 4.0.