Overview
- District ID
- ma-sd-d21
- State
- Massachusetts
- Chamber
- Upper chamber (state senate)
- District Code
- D21
- Land Area
- 285.4 sq mi
- Water Area
- 198.7 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 2 counties
Places
Showing all 9 places
Overlapping Congressional Districts
| Congressional district | Population in both | Share of this district's population | Share of the congressional district's population | Share of this district's land |
|---|
| MA District 6 | 180,195 | 100.0% | 23.1% | 100.0% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 146,552
- Active Voters
- 121,293 (82.8%)
Party Registration
| Party | Voters | Share |
|---|
| Democratic | 28,822 | 19.7% |
| Republican | <10 | — |
| Unaffiliated | 0 | 0.0% |
| Other parties | 101,830 | 69.5% |
| No party recorded | <10 | — |
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 42,061 (28.7%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 116,677 (79.6%) | 26,307 (18.0%) | 25,718 (17.5%) |
| 2021–2022 | 91,074 (62.1%) | 24,012 (16.4%) | 10,687 (7.3%) |
| 2019–2020 | 109,430 (74.7%) | 50,537 (34.5%) | 13,962 (9.5%) |
| 2017–2018 | 84,896 (57.9%) | 15,290 (10.4%) | 9,924 (6.8%) |
| 2015–2016 | 94,293 (64.3%) | 33,734 (23.0%) | 23,234 (15.9%) |
| 2013–2014 | 67,122 (45.8%) | 14,919 (10.2%) | 5,440 (3.7%) |
| 2011–2012 | 81,701 (55.7%) | 6,915 (4.7%) | 13,237 (9.0%) |
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
- 180,919 (± 660)
- Median Age
- 47.0
- Median Household Income
- $134,508 (± $5,114)
- High School Graduate or Higher (age 25+)
- 96.3%
- Bachelor's Degree or Higher (age 25+)
- 56.6%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 35,040 | 19.4% |
| 18 to 64 | 104,244 | 57.6% |
| 65 and over | 41,635 | 23.0% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 6,609 | 3.7% |
| White, not Hispanic | 160,492 | 88.7% |
| Black, not Hispanic | 1,760 | 1.0% |
| Asian, not Hispanic | 4,598 | 2.5% |
| American Indian / Alaska Native, not Hispanic | 28 | 0.0% |
| Native Hawaiian / Pacific Islander, not Hispanic | 1 | 0.0% |
| Some other race, not Hispanic | 1,175 | 0.6% |
| Two or more races, not Hispanic | 6,256 | 3.5% |
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
- 176,305
- Citizen Voting Age Population (CVAP)
- 141,686
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 170,430 | 96.7% |
| Hispanic | 5,873 | 3.3% |
| White | 162,227 | 92.0% |
| Black | 1,510 | 0.9% |
| Asian | 3,572 | 2.0% |
| American Indian / Alaska Native | 30 | 0.0% |
| Native Hawaiian / Pacific Islander | 1 | 0.0% |
| Two or More Races | 242 | 0.1% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 137,758 | 97.2% |
| Hispanic | 3,931 | 2.8% |
| White | 132,137 | 93.3% |
| Black | 1,598 | 1.1% |
| Asian | 3,534 | 2.5% |
| American Indian / Alaska Native | 524 | 0.4% |
| Native Hawaiian / Pacific Islander | 0 | 0.0% |
| Two or More Races | 92 | 0.1% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
