- Lead
- 82,263
- Total
- 428,680
- vs nation
- D+20.7
Pennsylvania 12th Congressional District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 85,666
- Total
- 431,273
- vs nation
- D+15.4
- Lead
- 68,938
- Total
- 398,599
- vs nation
- D+15.2
- Lead
- 64,990
- Total
- 376,551
- vs nation
- D+13.4
- Lead
- 75,442
- Total
- 395,378
- vs nation
- D+11.8
- Lead
- 75,427
- Total
- 390,242
- vs nation
- D+21.8
- Lead
- 74,277
- Total
- 351,535
- vs nation
- D+20.6
- Lead
- 66,612
- Total
- 322,733
- vs nation
- D+12.1
Key facts
- 2024 presidential margin
- D+19.2MIT Election Lab
- Population
- 764,9572024 5-year
- Population density
- 1,797 / sq mi2024 5-year · TIGER/Line
- Land area
- 426 sq miTIGER/Line
- Median household income
- $71,9862024 5-year
- White (non-Hispanic)
- 72.9%2024 5-year
- Black
- 15.1%2024 5-year
- Hispanic / Latino
- 2.8%2024 5-year
- Peak Democratic margin
- D+41.6 in 1964MIT Election Lab
- Peak Republican margin
- R+49.0 in 1904MIT Election Lab
- Most similar
- Congressional District 17, PA · twin score 85.0
presidential history
Party record book
Pennsylvania 12th Congressional 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
70.6%
300,606 votes · D+41.6 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 69.1%
Republican
Theodore Roosevelt1904
71.4%
46,641 votes · R+49.0 · modeled estimate
Runner-up · William McKinley, 1896 · 65.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Lyndon B. Johnson1964
300,606votes
70.6% of the vote · D+41.6 · modeled estimate
Runner-up · John F. Kennedy, 1960 · 267,550 votes
Republican
Dwight D. Eisenhower1956
196,677votes
49.5% of the vote · D+0.9 · modeled estimate
Runner-up · Richard Nixon, 1972 · 192,974 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
Walter Mondale1984
+39.1pts D vs U.S.
Place D+20.9 · U.S. R+18.2 · modeled estimate
Runner-up · Michael Dukakis, 1988 · +34.9 pts
Republican
Theodore Roosevelt1904
+29.3pts R vs U.S.
Place R+49.0 · U.S. R+19.7 · modeled estimate
Runner-up · William McKinley, 1896 · +27.3 pts
Current officeholders
Federal officeholders only. State and local officeholders are planned for the next data pass.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
Pennsylvania 12th Congressional District sits in the Mid-Atlantic. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 41.6 points in 1964 and a Republican high of 49.0 points in 1904. Between 2020 and 2024 the district moved 0.7 points toward the Republican candidate; the 2024 margin was 19.2 points.
A population of 764,957, a 73% non-Hispanic-white share, and a median household income of $71,986 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 17 and Congressional District 25.
The congressional 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 12th Congressional District. Akashic. https://akashic.app/cd/4212/. Accessed May 20, 2026. License: CC BY 4.0.