99chambers

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

Massachusetts's 4th District

A district of about 782,000 people, 50% of adults with a bachelor's degree. It votes D+22.3 relative to the nation for president.

Jake Auchincloss (D) · since Jan 3, 2021Next election Nov 7, 2028The 2026 race →
MA-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+22.3111th most
Democratic
Most DemocraticMost Republican218th seat · the majority line75826MA-4319

Labels below the bar mark 8 other seats in Massachusetts.

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.

20242026
U.S. SenateD+56.2No race
U.S. HouseNo raceD+32.8

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 Massachusetts. The black marker is MA-4.

Adults with a bachelor's degree50% 89th pct · 5th of 9 in MA

Higher than 89% of seats.

White adults without a degree40% 56th pct · 3rd of 9 in MA

Higher than 56% of seats.

Hispanic residents7% 25th pct · 8th of 9 in MA

Lower than 75% of seats.

Black residents3% 25th pct · 7th of 9 in MA

Lower than 75% of seats.

Asian residents7% 75th pct · 6th of 9 in MA

Higher than 75% of seats.

People per square mile1,102 70th pct · 4th of 9 in MA

Denser than 70% 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-6
50% college gradsD+22.8Held DPA-4
49% college gradsD+16.8Held DMN-3
52% college gradsD+21.6Held DMA-2
46% college gradsD+26.1Held 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. Jake Auchincloss (D)
    2023– · Won 2022 unopposed, 2024 by 99.2, 2026 by 32.8

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