Massachusetts 13th Middlesex District

State Legislative District Profile (Lower Chamber)

Overview

District ID
ma-hd-071
State
Massachusetts
Chamber
Lower chamber
District Code
071
Land Area
59.5 sq mi
Water Area
2.19 sq mi

Boundary

Boundary of Massachusetts 13th 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 County59.53 sq mi100.0%7.3%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Marlborough city4.37 sq mi7.3%21.0%
West Concord CDP0.96 sq mi1.6%28.6%
Cochituate CDP0.40 sq mi0.7%10.4%

Showing all 3 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 529,63569.3%3.8%73.2%
MA District 313,10730.7%1.7%26.8%

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

Voters

Registered Voters
32,806
Active Voters
27,638 (84.2%)

Party Registration

PartyVotersShare
Democratic8,91927.2%
Republican2,4757.5%
Unaffiliated00.0%
Other parties21,41265.3%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20266,582 (20.1%)0 (0.0%)0 (0.0%)
2023–202426,766 (81.6%)8,220 (25.1%)4,541 (13.8%)
2021–202220,982 (64.0%)6,609 (20.1%)1,589 (4.8%)
2019–202024,738 (75.4%)14,963 (45.6%)2,038 (6.2%)
2017–201820,022 (61.0%)5,534 (16.9%)1,445 (4.4%)
2015–201620,811 (63.4%)9,023 (27.5%)3,958 (12.1%)
2013–201415,127 (46.1%)4,052 (12.4%)750 (2.3%)
2011–201218,088 (55.1%)2,830 (8.6%)2,538 (7.7%)

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
42,797 (± 1,307)
Median Age
44.7
Median Household Income
$212,813 (± $13,663)
High School Graduate or Higher (age 25+)
97.6%
Bachelor's Degree or Higher (age 25+)
79.4%

Population by Age

GroupPeopleShare
Under 1810,92325.5%
18 to 6423,61355.2%
65 and over8,26119.3%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)1,8344.3%
White, not Hispanic32,37175.6%
Black, not Hispanic3720.9%
Asian, not Hispanic4,50410.5%
American Indian / Alaska Native, not Hispanic430.1%
Native Hawaiian / Pacific Islander, not Hispanic240.1%
Some other race, not Hispanic6121.4%
Two or more races, not Hispanic3,0377.1%

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
40,618
Citizen Voting Age Population (CVAP)
29,881

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic38,90095.8%
Hispanic1,7144.2%
White33,51182.5%
Black3871.0%
Asian3,4158.4%
American Indian / Alaska Native750.2%
Native Hawaiian / Pacific Islander230.1%
Two or More Races1230.3%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic28,99197.0%
Hispanic8863.0%
White25,75086.2%
Black3521.2%
Asian2,6578.9%
American Indian / Alaska Native1790.6%
Native Hawaiian / Pacific Islander260.1%
Two or More Races190.1%

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