- Lead
- 18,982
- Total
- 31,758
- vs nation
- R+58.3
Pennsylvania 66th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 18,696
- Total
- 31,337
- vs nation
- R+64.1
- Lead
- 16,091
- Total
- 27,157
- vs nation
- R+61.3
- Lead
- 11,646
- Total
- 25,042
- vs nation
- R+50.4
- Lead
- 8,183
- Total
- 25,880
- vs nation
- R+38.9
- Lead
- 10,264
- Total
- 26,202
- vs nation
- R+36.7
- Lead
- 8,287
- Total
- 23,309
- vs nation
- R+36.1
- Lead
- 3,753
- Total
- 21,733
- vs nation
- R+25.8
Key facts
- 2024 presidential margin
- R+59.8MIT Election Lab
- Population
- 62,1812024 5-year
- Population density
- 63 / sq mi2024 5-year · TIGER/Line
- Land area
- 987 sq miTIGER/Line
- Median household income
- $59,4212024 5-year
- White (non-Hispanic)
- 95.4%2024 5-year
- Black
- 0.3%2024 5-year
- Hispanic / Latino
- 0.8%2024 5-year
- Peak Democratic margin
- D+7.7 in 1964MIT Election Lab
- Peak Republican margin
- R+59.8 in 2024MIT Election Lab
- Most similar
- State House District 63, PA · twin score 98.0
presidential history
Party record book
Pennsylvania 66th State House 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
53.8%
13,000 votes · D+7.7 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 44.2%
Republican
Donald Trump2024
79.5%
25,250 votes · R+59.8 · modeled estimate
Runner-up · Donald Trump, 2020 · 79.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Lyndon B. Johnson1964
13,000votes
53.8% of the vote · D+7.7 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 12,916 votes
Republican
Donald Trump2024
25,250votes
79.5% of the vote · R+59.8 · modeled estimate
Runner-up · Donald Trump, 2020 · 24,816 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
Woodrow Wilson1912
−13.2pts D vs U.S.
Place D+6.4 · U.S. D+19.5 · a third-party candidate carried the Place · modeled estimate
Runner-up · Jimmy Carter, 1980 · −14.4 pts
Republican
Donald Trump2020
+64.1pts R vs U.S.
Place R+59.7 · U.S. D+4.5 · modeled estimate
Runner-up · Donald Trump, 2016 · +61.3 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.
Posting an R+59.8 margin in 2024, this district ranks among the deepest red constituencies in the state, suggesting a rural or small-town electorate with little competitive history at the federal level.
Across the recorded series it reached a Democratic high of 7.7 points in 1964 and a Republican high of 59.8 points in 2024. The 2024 margin was 59.8 points.
A population of 62,181, a 95% non-Hispanic-white share, and a median household income of $59,421 describe the district. The district's voting pattern over the last decade is most similar to that of State House District 63 and State House District 69.
The state-house 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 66th State House District. Akashic. https://akashic.app/sld-lower/42066/. Accessed May 20, 2026. License: CC BY 4.0.