Massachusetts 18th Suffolk District

State Legislative District Profile (Lower Chamber)

Overview

District ID
ma-hd-140
State
Massachusetts
Chamber
Lower chamber
District Code
140
Land Area
3.07 sq mi
Water Area
0.34 sq mi

Boundary

Boundary of Massachusetts 18th 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 County2.85 sq mi92.8%4.9%
Middlesex County0.22 sq mi7.2%<0.1%

Showing all 2 counties

Places

PlaceOverlapShare of district landShare of place land
Boston city2.85 sq mi92.8%5.9%
Cambridge city0.22 sq mi7.2%3.4%

Showing all 2 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 742,815100.0%5.5%100.0%

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

Voters

Registered Voters
19,125
Active Voters
16,648 (87.0%)

Party Registration

PartyVotersShare
Democratic6,37133.3%
Republican6673.5%
Unaffiliated00.0%
Other parties12,08763.2%
No party recorded00.0%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20264,876 (25.5%)0 (0.0%)0 (0.0%)
2023–202411,564 (60.5%)3,220 (16.8%)774 (4.0%)
2021–20228,022 (41.9%)2,706 (14.1%)258 (1.3%)
2019–202010,132 (53.0%)6,239 (32.6%)505 (2.6%)
2017–20186,721 (35.1%)2,382 (12.5%)262 (1.4%)
2015–20166,726 (35.2%)3,204 (16.8%)623 (3.3%)
2013–20143,842 (20.1%)1,225 (6.4%)120 (0.6%)
2011–20124,754 (24.9%)748 (3.9%)328 (1.7%)

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
39,560 (± 1,823)
Median Age
25.6
Median Household Income
$95,507 (± $6,285)
High School Graduate or Higher (age 25+)
93.4%
Bachelor's Degree or Higher (age 25+)
73.8%

Population by Age

GroupPeopleShare
Under 182,9567.5%
18 to 6433,44484.5%
65 and over3,1608.0%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)3,6749.3%
White, not Hispanic23,01958.2%
Black, not Hispanic2,8707.3%
Asian, not Hispanic7,05517.8%
American Indian / Alaska Native, not Hispanic370.1%
Native Hawaiian / Pacific Islander, not Hispanic110.0%
Some other race, not Hispanic4351.1%
Two or more races, not Hispanic2,4596.2%

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
34,209
Citizen Voting Age Population (CVAP)
31,400

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic31,33491.6%
Hispanic2,8728.4%
White22,26965.1%
Black2,7338.0%
Asian4,35112.7%
American Indian / Alaska Native370.1%
Native Hawaiian / Pacific Islander90.0%
Two or More Races2400.7%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic29,16892.9%
Hispanic2,2317.1%
White21,13367.3%
Black3,0309.6%
Asian4,76615.2%
American Indian / Alaska Native1380.4%
Native Hawaiian / Pacific Islander100.0%
Two or More Races1050.3%

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