99chambers

U.S. House seat · lines in effect since 2022

Pennsylvania's 4th District

A district of about 779,000 people, 49% of adults with a bachelor's degree. It votes D+16.8 relative to the nation for president.

Madeleine Dean (D) · since Jan 3, 2019Next election Nov 7, 2028The 2026 race →
PA-4

Source: 2026 results: civicAPI; boundaries: Census Bureau TIGER/LineUpdated Nov 7, 2026, 3:01 PM ET

Where it sits among all 435 seats

Every U.S. House seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.

D+16.8133rd most
Democratic
Most DemocraticMost Republican218th seat · the majority line32512PA-46171710811161491513

Labels below the bar mark 16 other seats in Pennsylvania.

Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Every race on these lines

Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.

20162018202220242026
U.S. SenateD+5.3D+25.9No raceR+22.0No race
GovernorNo raceD+29.5No raceNo raceNo race
U.S. HouseNo raceNo raceD+22.6D+18.1D+34.2

Outlined: the race for this seat itselfBlank: no race that year

Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 435 seats. Small marks are other seats in Pennsylvania. The black marker is PA-4.

Adults with a bachelor's degree49% 88th pct · 1st of 17 in PA

Higher than 88% of seats.

White adults without a degree39% 53rd pct · 13th of 17 in PA

Higher than 53% of seats.

Hispanic residents6% 23rd pct · 10th of 17 in PA

Lower than 77% of seats.

Black residents8% 53rd pct · 6th of 17 in PA

Higher than 53% of seats.

Asian residents6% 72nd pct · 4th of 17 in PA

Higher than 72% of seats.

People per square mile1,061 69th pct · 6th of 17 in PA

Denser than 69% of seats.

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET

Seats most like this one

Nearest seats on demographics, density and lean.

MA-4
50% college gradsD+22.3Held DMN-3
52% college gradsD+21.6Held DMA-6
50% college gradsD+22.8Held DNY-20
43% college gradsD+15.6Held D

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Who has held it

These lines took effect in 2022.

  1. Madeleine Dean (D)
    2027– · Won 2026 by 34.2
  2. Madeleine D. Cunnane (D)
    2023–2027 · Won 2022 by 22.6, 2024 by 18.1

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)