Massachusetts 12th Suffolk District

State Legislative District Profile (Lower Chamber)

Overview

District ID
ma-hd-134
State
Massachusetts
Chamber
Lower chamber
District Code
134
Land Area
4.01 sq mi
Water Area
0.12 sq mi

Boundary

Boundary of Massachusetts 12th Suffolk District

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Suffolk County2.94 sq mi73.3%5.0%
Norfolk County1.07 sq mi26.7%0.3%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Boston city2.94 sq mi73.3%6.1%
Milton CDP1.07 sq mi26.7%8.2%

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 739,89893.1%5.1%86.9%
MA District 82,9346.9%0.4%13.1%

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

Voters

Registered Voters
30,793
Active Voters
28,863 (93.7%)

Party Registration

PartyVotersShare
Democratic14,35046.6%
Republican7052.3%
Unaffiliated00.0%
Other parties15,73851.1%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20269,544 (31.0%)0 (0.0%)0 (0.0%)
2023–202419,127 (62.1%)6,877 (22.3%)906 (2.9%)
2021–202214,379 (46.7%)6,587 (21.4%)263 (0.9%)
2019–202019,313 (62.7%)12,497 (40.6%)490 (1.6%)
2017–201814,436 (46.9%)6,696 (21.7%)291 (0.9%)
2015–201616,197 (52.6%)9,153 (29.7%)692 (2.2%)
2013–201411,439 (37.1%)3,909 (12.7%)149 (0.5%)
2011–201214,289 (46.4%)2,492 (8.1%)238 (0.8%)

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
47,128 (± 2,445)
Median Age
40.2
Median Household Income
$97,640 (± $9,869)
High School Graduate or Higher (age 25+)
89.2%
Bachelor's Degree or Higher (age 25+)
36.1%

Population by Age

GroupPeopleShare
Under 189,84220.9%
18 to 6429,74363.1%
65 and over7,54316.0%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)7,09015.0%
White, not Hispanic8,07517.1%
Black, not Hispanic26,29055.8%
Asian, not Hispanic1,1502.4%
American Indian / Alaska Native, not Hispanic690.1%
Native Hawaiian / Pacific Islander, not Hispanic970.2%
Some other race, not Hispanic3330.7%
Two or more races, not Hispanic4,0248.5%

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
41,138
Citizen Voting Age Population (CVAP)
31,936

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic35,40886.1%
Hispanic5,73313.9%
White8,16619.9%
Black24,45859.5%
Asian1,1992.9%
American Indian / Alaska Native690.2%
Native Hawaiian / Pacific Islander20.0%
Two or More Races3460.8%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic28,20888.3%
Hispanic3,72711.7%
White6,73121.1%
Black20,10463.0%
Asian1,1413.6%
American Indian / Alaska Native3201.0%
Native Hawaiian / Pacific Islander20.0%
Two or More Races900.3%

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