Massachusetts State Senate seat · lines in effect since 2022
Massachusetts State Senate: First Plymouth and Norfolk District
A district of about 174,000 people, 57% of adults with a bachelor's degree. It votes D+20.6 relative to the nation for president.
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.
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.
| 2022 | |
|---|---|
| Massachusetts State Senate | R+21.2 |
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 D31.
Higher than 77% of seats.
Higher than 59% of seats.
Lower than 97% of seats.
Lower than 95% of seats.
Lower than 62% of seats.
Less dense than 82% 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 D2157% college gradsD+24.3Held RDistrict D14
58% college gradsD+25.7Held DDistrict D35
51% college gradsD+18.3Held DDistrict D20
50% college gradsD+16.1Held 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.
- Patrick O'Connor (R)
2027– · Won 2026 unopposed - Patrick A. O. Connor (R)
2025–2027 · Won 2024 unopposed - Patrick Michael Oconnor (R)
2023–2025 · Won 2022 by 21.2
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)