99chambers

Massachusetts House of Representatives seat · lines in effect since 2022

Massachusetts House of Representatives: 10th Bristol District

A district of about 40,000 people, 38% of adults with a bachelor's degree. It votes D+4.3 relative to the nation for president.

Mark Sylvia (D) · since Nov 5, 2024Next election Nov 7, 2028The 2026 race →

Where it sits among all 160 seats

Every Massachusetts House of Representatives 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+4.3135th most
Democratic
Most DemocraticMost Republican81st seat · the majority lineDistrict 19

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.

202220242026
Massachusetts House of RepresentativesD+12.5D+5.3D+18.7

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 160 seats. Small marks are other seats in Massachusetts. The black marker is District 19.

Adults with a bachelor's degree38% 35th pct · 105th of 160 in MA

Lower than 65% of seats.

White adults without a degree55% 90th pct · 17th of 160 in MA

Higher than 90% of seats.

Hispanic residents3% 8th pct · 148th of 160 in MA

Lower than 92% of seats.

Black residents1% 4th pct · 153rd of 160 in MA

Lower than 96% of seats.

Asian residents1% 6th pct · 151st of 160 in MA

Lower than 94% of seats.

People per square mile381 9th pct · 145th of 160 in MA

Less dense than 91% 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 122
41% college gradsD+3.1CountingDistrict 18
36% college gradsD+2.0Held DDistrict 148
39% college gradsD+1.3CountingDistrict 149
39% college gradsR+0.5Held R

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. Mark David Sylvia (D)
    2025– · Won 2024 by 5.3, 2026 by 18.7
  2. William M. Straus (D)
    2023–2025 · Won 2022 by 12.5

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