Massachusetts 3rd Suffolk District

State Legislative District Profile (Lower Chamber)

Overview

District ID
ma-hd-125
State
Massachusetts
Chamber
Lower chamber
District Code
125
Land Area
1.33 sq mi
Water Area
0.33 sq mi

Boundary

Boundary of Massachusetts 3rd 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 County1.33 sq mi100.0%2.3%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Boston city1.33 sq mi100.0%2.8%

Showing all 1 place

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 822,38951.9%2.9%58.4%
MA District 720,72448.1%2.7%41.6%

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

Voters

Registered Voters
27,594
Active Voters
24,661 (89.4%)

Party Registration

PartyVotersShare
Democratic8,27130.0%
Republican<10—
Unaffiliated00.0%
Other parties17,72364.2%
No party recorded<10—

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20267,589 (27.5%)0 (0.0%)0 (0.0%)
2023–202417,169 (62.2%)4,731 (17.1%)1,447 (5.2%)
2021–202212,506 (45.3%)4,130 (15.0%)430 (1.6%)
2019–202015,123 (54.8%)8,453 (30.6%)738 (2.7%)
2017–201810,259 (37.2%)3,428 (12.4%)392 (1.4%)
2015–201610,624 (38.5%)4,235 (15.3%)1,278 (4.6%)
2013–20146,819 (24.7%)2,007 (7.3%)245 (0.9%)
2011–20127,976 (28.9%)1,330 (4.8%)710 (2.6%)

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
38,745 (± 1,555)
Median Age
32.3
Median Household Income
$119,415 (± $8,778)
High School Graduate or Higher (age 25+)
92.5%
Bachelor's Degree or Higher (age 25+)
73.1%

Population by Age

GroupPeopleShare
Under 182,9517.6%
18 to 6430,27678.1%
65 and over5,51814.2%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)3,2018.3%
White, not Hispanic23,87361.6%
Black, not Hispanic1,5874.1%
Asian, not Hispanic8,21921.2%
American Indian / Alaska Native, not Hispanic100.0%
Native Hawaiian / Pacific Islander, not Hispanic140.0%
Some other race, not Hispanic740.2%
Two or more races, not Hispanic1,7674.6%

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
33,968
Citizen Voting Age Population (CVAP)
31,160

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic31,55092.9%
Hispanic2,4147.1%
White23,12568.1%
Black1,6294.8%
Asian5,71116.8%
American Indian / Alaska Native120.0%
Native Hawaiian / Pacific Islander120.0%
Two or More Races2170.6%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic29,02293.1%
Hispanic2,1426.9%
White21,85670.1%
Black1,5465.0%
Asian5,38117.3%
American Indian / Alaska Native850.3%
Native Hawaiian / Pacific Islander110.0%
Two or More Races1330.4%

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