Overview
- District ID
- ma-sd-d15
- State
- Massachusetts
- Chamber
- Upper chamber (state senate)
- District Code
- D15
- Land Area
- 126 sq mi
- Water Area
- 4.89 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
| County | Overlap | Share of district land | Share of county land |
|---|
| Middlesex County | 126.05 sq mi | 100.0% | 15.4% |
Showing all 1 county
Places
Showing all 4 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 5 | 96,451 | 56.6% | 12.3% | 40.2% |
| MA District 3 | 60,120 | 35.3% | 7.7% | 49.3% |
| MA District 6 | 13,687 | 8.0% | 1.8% | 10.5% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 115,612
- Active Voters
- 93,212 (80.6%)
Party Registration
| Party | Voters | Share |
|---|
| Democratic | 29,473 | 25.5% |
| Republican | <10 | — |
| Unaffiliated | 0 | 0.0% |
| Other parties | 78,012 | 67.5% |
| No party recorded | <10 | — |
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 22,632 (19.6%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 87,833 (76.0%) | 26,458 (22.9%) | 15,114 (13.1%) |
| 2021–2022 | 67,115 (58.1%) | 22,868 (19.8%) | 6,133 (5.3%) |
| 2019–2020 | 82,100 (71.0%) | 46,051 (39.8%) | 7,880 (6.8%) |
| 2017–2018 | 63,480 (54.9%) | 18,199 (15.7%) | 4,925 (4.3%) |
| 2015–2016 | 68,167 (59.0%) | 26,694 (23.1%) | 12,437 (10.8%) |
| 2013–2014 | 46,710 (40.4%) | 11,781 (10.2%) | 2,366 (2.0%) |
| 2011–2012 | 57,846 (50.0%) | 10,445 (9.0%) | 8,704 (7.5%) |
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
- 169,477 (± 869)
- Median Age
- 40.3
- Median Household Income
- $147,450 (± $6,595)
- High School Graduate or Higher (age 25+)
- 95.0%
- Bachelor's Degree or Higher (age 25+)
- 65.1%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 33,213 | 19.6% |
| 18 to 64 | 104,816 | 61.8% |
| 65 and over | 31,448 | 18.6% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 15,667 | 9.2% |
| White, not Hispanic | 114,000 | 67.3% |
| Black, not Hispanic | 7,572 | 4.5% |
| Asian, not Hispanic | 22,870 | 13.5% |
| American Indian / Alaska Native, not Hispanic | 273 | 0.2% |
| Native Hawaiian / Pacific Islander, not Hispanic | 106 | 0.1% |
| Some other race, not Hispanic | 1,592 | 0.9% |
| Two or more races, not Hispanic | 7,397 | 4.4% |
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
- 153,731
- Citizen Voting Age Population (CVAP)
- 122,082
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 141,356 | 92.0% |
| Hispanic | 12,371 | 8.0% |
| White | 114,332 | 74.4% |
| Black | 6,051 | 3.9% |
| Asian | 16,203 | 10.5% |
| American Indian / Alaska Native | 272 | 0.2% |
| Native Hawaiian / Pacific Islander | 95 | 0.1% |
| Two or More Races | 308 | 0.2% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 114,284 | 93.6% |
| Hispanic | 7,797 | 6.4% |
| White | 94,202 | 77.2% |
| Black | 5,344 | 4.4% |
| Asian | 13,776 | 11.3% |
| American Indian / Alaska Native | 647 | 0.5% |
| Native Hawaiian / Pacific Islander | 98 | 0.1% |
| Two or More Races | 235 | 0.2% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
