Massachusetts House of Representatives seat · lines in effect since 2022
Massachusetts House of Representatives: 3rd Norfolk District
A district of about 42,000 people, 46% of adults with a bachelor's degree. It votes D+20.7 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 98.
Lower than 52% of seats.
Higher than 50% of seats.
Lower than 53% of seats.
Higher than 72% of seats.
Higher than 91% of seats.
Denser than 66% 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 10046% college gradsD+10.3Held DDistrict 97
51% college gradsD+29.2Held DDistrict 75
33% college gradsD+26.1Held DDistrict 88
50% college gradsD+23.9Held 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.
- Ronald Mariano (D)
2023– · Won 2022 by 94.7, 2024 unopposed, 2026 unopposed
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)