- Lead
- 7,179
- Total
- 144,864
- vs nation
- D+6.4
Pennsylvania 18th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 10,718
- Total
- 139,930
- vs nation
- D+3.2
- Lead
- 4,277
- Total
- 118,772
- vs nation
- D+1.5
- Lead
- 12,734
- Total
- 108,349
- vs nation
- D+7.9
- Lead
- 21,866
- Total
- 112,961
- vs nation
- D+12.1
- Lead
- 8,441
- Total
- 104,561
- vs nation
- D+10.5
- Lead
- 10,200
- Total
- 86,077
- vs nation
- D+11.3
- Lead
- 11,114
- Total
- 75,575
- vs nation
- D+6.2
Key facts
- 2024 presidential margin
- D+5.0MIT Election Lab
- Population
- 263,4042024 5-year
- Population density
- 1,073 / sq mi2024 5-year · TIGER/Line
- Land area
- 246 sq miTIGER/Line
- Median household income
- $86,5272024 5-year
- White (non-Hispanic)
- 68.8%2024 5-year
- Black
- 6.5%2024 5-year
- Hispanic / Latino
- 16.9%2024 5-year
- Peak Democratic margin
- D+51.0 in 1964MIT Election Lab
- Peak Republican margin
- R+37.6 in 1928MIT Election Lab
- Most similar
- State Senate District 14, PA · twin score 86.9
presidential history
Party record book
Pennsylvania 18th 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
Lyndon B. Johnson1964
75.2%
51,270 votes · D+51.0 · modeled estimate
Runner-up · Samuel J. Tilden, 1876 · 66.8%
Republican
Herbert Hoover1928
68.4%
28,465 votes · R+37.6 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · 56.3%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Kamala Harris2024
75,295votes
52.0% of the vote · D+5.0 · modeled estimate
Runner-up · Joe Biden, 2020 · 74,261 votes
Republican
Donald Trump2024
68,116votes
47.0% of the vote · D+5.0 · modeled estimate
Runner-up · Donald Trump, 2020 · 63,543 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
Lyndon B. Johnson1964
+28.4pts D vs U.S.
Place D+51.0 · U.S. D+22.6 · modeled estimate
Runner-up · Grover Cleveland, 1892 · +25.1 pts
Republican
Herbert Hoover1928
+20.2pts R vs U.S.
Place R+37.6 · U.S. R+17.5 · modeled estimate
Runner-up · Herbert Hoover, 1932 · +4.6 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.
Its 2024 presidential margin of D+5.0 ranked among Pennsylvania's closest, against D+19.4 in 2008. About 213,000 residents lived here, with White alone at 73.9% in the 2024 ACS 5-year.
Across the recorded series it reached a Democratic high of 51.0 points in 1964 and a Republican high of 37.6 points in 1928. Between 2020 and 2024 the district moved 2.7 points toward the Republican candidate; the 2024 margin was 5.0 points.
A population of 263,404, a 69% non-Hispanic-white share, and a median household income of $86,527 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 14 and State Senate District 39.
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 18th State Senate District. Akashic. https://akashic.app/sld-upper/42018/. Accessed May 20, 2026. License: CC BY 4.0.