- Lead
- 83,685
- Total
- 138,688
- vs nation
- D+61.8
Pennsylvania 1st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 82,230
- Total
- 133,938
- vs nation
- D+56.9
- Lead
- 70,956
- Total
- 116,091
- vs nation
- D+59.0
- Lead
- 73,991
- Total
- 111,908
- vs nation
- D+62.3
- Lead
- 71,117
- Total
- 117,280
- vs nation
- D+53.4
- Lead
- 60,213
- Total
- 110,341
- vs nation
- D+57.0
- Lead
- 51,384
- Total
- 91,680
- vs nation
- D+55.5
- Lead
- 48,641
- Total
- 89,156
- vs nation
- D+46.0
Key facts
- 2024 presidential margin
- D+60.3MIT Election Lab
- Population
- 249,8332024 5-year
- Population density
- 11,305 / sq mi2024 5-year · TIGER/Line
- Land area
- 22.1 sq miTIGER/Line
- Median household income
- $99,4632024 5-year
- White (non-Hispanic)
- 64.0%2024 5-year
- Black
- 8.3%2024 5-year
- Hispanic / Latino
- 10.2%2024 5-year
- Peak Democratic margin
- D+66.1 in 2012MIT Election Lab
- Peak Republican margin
- R+68.2 in 1904MIT Election Lab
- Most similar
- State Senate District 7, IL · twin score 91.5
presidential history
Party record book
Pennsylvania 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 Obama2012
82.3%
92,091 votes · D+66.1 · modeled estimate
Runner-up · Joe Biden, 2020 · 80.3%
Republican
Theodore Roosevelt1904
82.2%
43,157 votes · R+68.2 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 77.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Kamala Harris2024
110,316votes
79.5% of the vote · D+60.3 · modeled estimate
Runner-up · Joe Biden, 2020 · 107,583 votes
Republican
Thomas E. Dewey1948
80,352votes
52.2% of the vote · R+8.2 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 79,213 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
Barack Obama2012
+62.3pts D vs U.S.
Place D+66.1 · U.S. D+3.9 · modeled estimate
Runner-up · Kamala Harris, 2024 · +61.8 pts
Republican
Theodore Roosevelt1904
+48.5pts R vs U.S.
Place R+68.2 · U.S. R+19.7 · modeled estimate
Runner-up · William McKinley, 1900 · +47.5 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.
Anchored in northwest Philadelphia, this district delivers some of the widest presidential margins in the state, reflecting a dense, majority-minority urban electorate that has voted Democratic by double digits for decades.
Across the recorded series it reached a Democratic high of 66.1 points in 2012 and a Republican high of 68.2 points in 1904. Between 2020 and 2024 the district moved 1.1 points toward the Republican candidate; the 2024 margin was 60.3 points.
A population of 249,833, a 64% non-Hispanic-white share, and a median household income of $99,463 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 7 and State Senate District 11.
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 →
Pennsylvania 1st State Senate District. Akashic. https://akashic.app/sld-upper/42001/. Accessed May 20, 2026. License: CC BY 4.0.