99chambers

Massachusetts State Senate seat · lines in effect since 2022

Massachusetts State Senate: Third Bristol and Plymouth District

A district of about 185,000 people, 32% of adults with a bachelor's degree. It votes R+2.3 relative to the nation for president.

Kelly Dooner (R) · since Nov 5, 2024Next election Nov 7, 2028The 2026 race →

Where it sits among all 40 seats

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

R+2.338th most
Democratic
Most DemocraticMost Republican21st seat · the majority lineDistrict D36

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.

20222024
Massachusetts State SenateD+8.6R+1.7

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 40 seats. Small marks are other seats in Massachusetts. The black marker is District D36.

Adults with a bachelor's degree32% 13th pct · 35th of 40 in MA

Lower than 87% of seats.

White adults without a degree57% 97th pct · 2nd of 40 in MA

Higher than 97% of seats.

Hispanic residents5% 10th pct · 36th of 40 in MA

Lower than 90% of seats.

Black residents4% 54th pct · 19th of 40 in MA

Higher than 54% of seats.

Asian residents1% 5th pct · 38th of 40 in MA

Lower than 95% of seats.

People per square mile513 21st pct · 32nd of 40 in MA

Less dense than 79% 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.

District D07
35% college gradsR+3.0Held RDistrict D37
26% college gradsR+4.2CountingDistrict D06
36% college gradsD+2.0CountingDistrict D38
25% college gradsD+6.3Held 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. Kelly A. Dooner (R)
    2025– · Won 2024 by 1.7, 2026 unopposed
  2. Marc R. Pacheco (D)
    2023–2025 · Won 2022 by 8.6

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