Michigan State House District 31

State Legislative District Profile (Lower Chamber)

Overview

District ID
mi-hd-031
State
Michigan
Chamber
Lower chamber
District Code
031
Land Area
389.3 sq mi
Water Area
3.67 sq mi

Boundary

Boundary of Michigan State House District 31

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Monroe County205.00 sq mi52.7%37.3%
Wayne County87.00 sq mi22.3%14.2%
Washtenaw County64.65 sq mi16.6%9.2%
Lenawee County32.65 sq mi8.4%4.4%

Showing all 4 counties

Places

PlaceOverlapShare of district landShare of place land
Romulus city14.51 sq mi3.7%40.7%
Dundee village5.24 sq mi1.3%99.7%
Milan city3.45 sq mi0.9%99.2%
Maybee village1.84 sq mi0.5%100.0%
Belleville city1.13 sq mi0.3%100.0%
Ida CDP0.59 sq mi0.2%23.8%

Showing all 6 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
MI District 664,22169.1%8.3%35.8%
MI District 523,85825.7%3.1%60.4%
MI District 134,8995.3%0.6%3.7%

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

Voters

Registered Voters
79,403
Active Voters
75,363 (94.9%)

Party Registration

This state's voter file does not record party registration.

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202616,208 (20.4%)0 (0.0%)0 (0.0%)
2023–202455,817 (70.3%)0 (0.0%)0 (0.0%)
2021–202242,512 (53.5%)0 (0.0%)0 (0.0%)
2019–202050,419 (63.5%)0 (0.0%)0 (0.0%)
2017–201837,021 (46.6%)0 (0.0%)0 (0.0%)
2015–201639,663 (50.0%)0 (0.0%)0 (0.0%)
2013–201423,873 (30.1%)0 (0.0%)0 (0.0%)
2011–201234,809 (43.8%)0 (0.0%)0 (0.0%)

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 01/01/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
92,999 (± 1,082)
Median Age
42.4
Median Household Income
$83,586 (± $3,264)
High School Graduate or Higher (age 25+)
93.3%
Bachelor's Degree or Higher (age 25+)
28.4%

Population by Age

GroupPeopleShare
Under 1817,34618.7%
18 to 6458,56263.0%
65 and over17,09118.4%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)3,9644.3%
White, not Hispanic70,09975.4%
Black, not Hispanic12,57513.5%
Asian, not Hispanic1,3701.5%
American Indian / Alaska Native, not Hispanic1280.1%
Native Hawaiian / Pacific Islander, not Hispanic160.0%
Some other race, not Hispanic4360.5%
Two or more races, not Hispanic4,4114.7%

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
91,245
Citizen Voting Age Population (CVAP)
74,015

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic87,56996.0%
Hispanic3,6784.0%
White70,87577.7%
Black12,28813.5%
Asian1,1371.2%
American Indian / Alaska Native550.1%
Native Hawaiian / Pacific Islander130.0%
Two or More Races1360.1%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic71,52496.6%
Hispanic2,4893.4%
White58,57379.1%
Black11,20315.1%
Asian1,0851.5%
American Indian / Alaska Native5920.8%
Native Hawaiian / Pacific Islander180.0%
Two or More Races770.1%

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