- Lead
- 24,093
- Total
- 147,945
- vs nation
- D+17.8
Pennsylvania 9th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 27,452
- Total
- 146,014
- vs nation
- D+14.3
- Lead
- 18,055
- Total
- 131,585
- vs nation
- D+11.6
- Lead
- 12,414
- Total
- 124,511
- vs nation
- D+6.1
- Lead
- 16,710
- Total
- 128,272
- vs nation
- D+5.8
- Lead
- 5,228
- Total
- 121,351
- vs nation
- D+6.8
- Lead
- 929
- Total
- 103,685
- vs nation
- D+0.4
- Lead
- 818
- Total
- 94,818
- vs nation
- R+7.7
Key facts
- 2024 presidential margin
- D+16.3MIT Election Lab
- Population
- 252,3082024 5-year
- Population density
- 1,151 / sq mi2024 5-year · TIGER/Line
- Land area
- 219 sq miTIGER/Line
- Median household income
- $105,8872024 5-year
- White (non-Hispanic)
- 67.8%2024 5-year
- Black
- 15.3%2024 5-year
- Hispanic / Latino
- 8.4%2024 5-year
- Peak Democratic margin
- D+18.8 in 2020MIT Election Lab
- Peak Republican margin
- R+70.2 in 1924MIT Election Lab
- Most similar
- State Senate District 26, PA · twin score 95.4
presidential history
Party record book
Pennsylvania 9th 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
Joe Biden2020
58.9%
85,947 votes · D+18.8 · modeled estimate
Runner-up · Kamala Harris, 2024 · 57.7%
Republican
Calvin Coolidge1924
83.0%
17,011 votes · R+70.2 · modeled estimate
Runner-up · Theodore Roosevelt, 1904 · 78.8%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
85,947votes
58.9% of the vote · D+18.8 · modeled estimate
Runner-up · Kamala Harris, 2024 · 85,337 votes
Republican
Richard Nixon1972
68,010votes
67.2% of the vote · R+36.0 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 66,622 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
+17.8pts D vs U.S.
Place D+16.3 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +14.3 pts
Republican
Herbert Hoover1932
+61.5pts R vs U.S.
Place R+43.7 · U.S. D+17.8 · modeled estimate
Runner-up · William McKinley, 1896 · +46.6 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.
Pennsylvania 9th State Senate District sits in the Mid-Atlantic. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 18.8 points in 2020 and a Republican high of 70.2 points in 1924. Between 2020 and 2024 the district moved 2.5 points toward the Republican candidate; the 2024 margin was 16.3 points.
A population of 252,308, a 68% non-Hispanic-white share, and a median household income of $105,887 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 26 and Norfolk and Suffolk District.
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 9th State Senate District. Akashic. https://akashic.app/sld-upper/42009/. Accessed May 20, 2026. License: CC BY 4.0.