99chambers

Massachusetts State Senate seat · lines in effect since 2022

Massachusetts State Senate: Middlesex and Worcester District

A district of about 179,000 people, 62% of adults with a bachelor's degree. It votes D+43.3 relative to the nation for president.

Jamie Eldridge (D) · since Nov 4, 2008Next election Nov 7, 2028The 2026 race →

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.

D+43.39th most
Democratic
Most DemocraticMost Republican21st seat · the majority lineDistrict D12

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.

20222026
Massachusetts State SenateD+40.5D+27.2

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 D12.

Adults with a bachelor's degree62% 90th pct · 5th of 40 in MA

Higher than 90% of seats.

White adults without a degree27% 31st pct · 28th of 40 in MA

Lower than 69% of seats.

Hispanic residents8% 38th pct · 25th of 40 in MA

Lower than 62% of seats.

Black residents3% 26th pct · 30th of 40 in MA

Lower than 74% of seats.

Asian residents11% 69th pct · 13th of 40 in MA

Higher than 69% of seats.

People per square mile902 36th pct · 26th of 40 in MA

Less dense than 64% 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 D13
60% college gradsD+42.6Held DDistrict D15
66% college gradsD+44.9Held DDistrict D16
58% college gradsD+34.5Held DDistrict D18
60% college gradsD+37.5Held 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.

  1. James B. Eldridge (D)
    2023– · Won 2022 by 40.5, 2024 unopposed, 2026 by 27.2, 2026 by 18.6

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