Massachusetts Norfolk and Suffolk District

State Legislative District Profile (Upper Chamber)

Overview

District ID
ma-sd-d18
State
Massachusetts
Chamber
Upper chamber (state senate)
District Code
D18
Land Area
63.9 sq mi
Water Area
1.79 sq mi

Boundary

Boundary of Massachusetts Norfolk and Suffolk District

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Norfolk County51.99 sq mi81.4%13.1%
Suffolk County11.88 sq mi18.6%20.4%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Boston city11.88 sq mi18.6%24.6%
Norwood CDP10.38 sq mi16.3%100.0%
Dedham CDP10.27 sq mi16.1%100.0%
Walpole CDP2.81 sq mi4.4%100.0%

Showing all 4 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 8144,36279.9%18.5%92.7%
MA District 736,30420.1%4.6%7.3%

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

Voters

Registered Voters
134,632
Active Voters
118,543 (88.0%)

Party Registration

PartyVotersShare
Democratic42,29831.4%
Republican8,6596.4%
Unaffiliated00.0%
Other parties83,67562.2%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202639,637 (29.4%)0 (0.0%)0 (0.0%)
2023–2024100,183 (74.4%)29,723 (22.1%)16,349 (12.1%)
2021–202279,352 (58.9%)27,055 (20.1%)6,048 (4.5%)
2019–202096,152 (71.4%)56,475 (41.9%)9,442 (7.0%)
2017–201874,941 (55.7%)23,891 (17.7%)5,939 (4.4%)
2015–201680,601 (59.9%)35,951 (26.7%)13,625 (10.1%)
2013–201458,286 (43.3%)15,711 (11.7%)2,702 (2.0%)
2011–201268,834 (51.1%)10,181 (7.6%)8,151 (6.1%)

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
181,232 (± 2,906)
Median Age
40.9
Median Household Income
$130,665 (± $3,428)
High School Graduate or Higher (age 25+)
94.1%
Bachelor's Degree or Higher (age 25+)
60.4%

Population by Age

GroupPeopleShare
Under 1839,23421.6%
18 to 64108,58559.9%
65 and over33,41318.4%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)20,33111.2%
White, not Hispanic122,53467.6%
Black, not Hispanic18,24610.1%
Asian, not Hispanic10,1275.6%
American Indian / Alaska Native, not Hispanic400.0%
Native Hawaiian / Pacific Islander, not Hispanic200.0%
Some other race, not Hispanic2,0761.1%
Two or more races, not Hispanic7,8584.3%

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
168,811
Citizen Voting Age Population (CVAP)
131,420

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic151,25389.6%
Hispanic17,56010.4%
White122,18372.4%
Black16,7219.9%
Asian7,4164.4%
American Indian / Alaska Native400.0%
Native Hawaiian / Pacific Islander210.0%
Two or More Races3980.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic119,41290.9%
Hispanic12,0129.1%
White98,87075.2%
Black13,47110.3%
Asian6,4664.9%
American Indian / Alaska Native4150.3%
Native Hawaiian / Pacific Islander140.0%
Two or More Races2930.2%

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