Massachusetts 12th Middlesex District

State Legislative District Profile (Lower Chamber)

Overview

District ID
ma-hd-070
State
Massachusetts
Chamber
Lower chamber
District Code
070
Land Area
12.6 sq mi
Water Area
0.23 sq mi

Boundary

Boundary of Massachusetts 12th Middlesex District

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Middlesex County9.07 sq mi71.8%1.1%
Norfolk County3.57 sq mi28.2%0.9%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Newton city9.07 sq mi71.8%50.9%
Brookline CDP3.57 sq mi28.2%52.8%

Showing all 2 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
MA District 446,052100.0%5.9%100.0%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
33,394
Active Voters
25,540 (76.5%)

Party Registration

PartyVotersShare
Democratic11,57934.7%
Republican1,5444.6%
Unaffiliated00.0%
Other parties20,27160.7%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202611,365 (34.0%)0 (0.0%)0 (0.0%)
2023–202425,152 (75.3%)8,952 (26.8%)2,101 (6.3%)
2021–202219,524 (58.5%)6,447 (19.3%)711 (2.1%)
2019–202023,478 (70.3%)16,303 (48.8%)1,467 (4.4%)
2017–201818,869 (56.5%)6,153 (18.4%)908 (2.7%)
2015–201619,212 (57.5%)9,488 (28.4%)2,529 (7.6%)
2013–201414,114 (42.3%)4,699 (14.1%)380 (1.1%)
2011–201216,425 (49.2%)2,892 (8.7%)1,456 (4.4%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 12/07/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
45,936 (± 1,625)
Median Age
44.7
Median Household Income
$191,264 (± $11,939)
High School Graduate or Higher (age 25+)
98.1%
Bachelor's Degree or Higher (age 25+)
84.3%

Population by Age

GroupPeopleShare
Under 1810,60823.1%
18 to 6425,84556.3%
65 and over9,48320.6%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)2,0294.4%
White, not Hispanic30,72266.9%
Black, not Hispanic7891.7%
Asian, not Hispanic9,37720.4%
American Indian / Alaska Native, not Hispanic00.0%
Native Hawaiian / Pacific Islander, not Hispanic100.0%
Some other race, not Hispanic6691.5%
Two or more races, not Hispanic2,3405.1%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
41,068
Citizen Voting Age Population (CVAP)
31,358

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic39,40095.9%
Hispanic1,6664.1%
White29,66872.2%
Black6371.6%
Asian7,25117.7%
American Indian / Alaska Native00.0%
Native Hawaiian / Pacific Islander100.0%
Two or More Races1140.3%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic30,29096.6%
Hispanic1,0713.4%
White24,27077.4%
Black5491.8%
Asian5,34817.1%
American Indian / Alaska Native360.1%
Native Hawaiian / Pacific Islander80.0%
Two or More Races820.3%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).