Massachusetts House of Representatives seat · lines in effect since 2022
Massachusetts House of Representatives: 9th Middlesex District
A district of about 50,000 people, 59% of adults with a bachelor's degree. It votes D+38.2 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
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2024 | |
|---|---|
| Massachusetts House of Representatives | D+52.0 |
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 67.
Higher than 74% of seats.
Lower than 64% of seats.
Higher than 75% of seats.
Higher than 77% of seats.
Higher than 78% of seats.
Denser than 72% 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 6859% college gradsD+46.6Held DDistrict 65
60% college gradsD+43.3Held DDistrict 90
59% college gradsD+41.1Held DDistrict 89
67% college gradsD+29.9Held 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.
- Thomas M. Stanley (D)
2023– · Won 2022 by 96.1, 2024 by 52.0, 2026 unopposed
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)