Massachusetts House of Representatives seat · lines in effect since 2022
Massachusetts House of Representatives: 12th Middlesex District
A district of about 47,000 people, 21% Asian, 84% of adults with a bachelor's degree. It votes D+63.9 relative to the nation for president.
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.
Democratic
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
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 70.
Higher than 98% of seats.
Lower than 93% of seats.
Lower than 75% of seats.
Lower than 67% of seats.
Higher than 96% of seats.
Denser than 67% 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 8280% college gradsD+66.2Held DDistrict 69
81% college gradsD+65.6Held DDistrict 140
73% college gradsD+64.0Held DDistrict 124
76% college gradsD+59.1Held 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.
- Greg Schwartz (D)
2025– · Won 2024 unopposed, 2026 unopposed - Ruth B. Balser (D)
2023–2025 · Won 2022 by 97.4
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)