Overview
- District ID
- mi-sd-031
- State
- Michigan
- Chamber
- Upper chamber (state senate)
- District Code
- 031
- Land Area
- 442.5 sq mi
- Water Area
- 2,056.3 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 2 counties
Places
Showing all 10 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 |
|---|
| MI District 4 | 203,677 | 77.0% | 26.3% | 71.1% |
| MI District 3 | 60,896 | 23.0% | 7.9% | 28.9% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 217,823
- Active Voters
- 209,977 (96.4%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 19,785 (9.1%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 163,986 (75.3%) | 0 (0.0%) | 0 (0.0%) |
| 2021–2022 | 132,275 (60.7%) | 0 (0.0%) | 0 (0.0%) |
| 2019–2020 | 147,460 (67.7%) | 0 (0.0%) | 0 (0.0%) |
| 2017–2018 | 110,636 (50.8%) | 0 (0.0%) | 0 (0.0%) |
| 2015–2016 | 118,223 (54.3%) | 0 (0.0%) | 0 (0.0%) |
| 2013–2014 | 72,194 (33.1%) | 0 (0.0%) | 0 (0.0%) |
| 2011–2012 | 103,887 (47.7%) | 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
- 269,589 (± 46)
- Median Age
- 38.2
- Median Household Income
- $90,910 (± $1,805)
- High School Graduate or Higher (age 25+)
- 94.4%
- Bachelor's Degree or Higher (age 25+)
- 39.7%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 63,448 | 23.5% |
| 18 to 64 | 157,165 | 58.3% |
| 65 and over | 48,976 | 18.2% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 30,932 | 11.5% |
| White, not Hispanic | 216,828 | 80.4% |
| Black, not Hispanic | 3,970 | 1.5% |
| Asian, not Hispanic | 7,895 | 2.9% |
| American Indian / Alaska Native, not Hispanic | 330 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 45 | 0.0% |
| Some other race, not Hispanic | 1,135 | 0.4% |
| Two or more races, not Hispanic | 8,454 | 3.1% |
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
- 262,122
- Citizen Voting Age Population (CVAP)
- 199,203
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 235,509 | 89.8% |
| Hispanic | 26,611 | 10.2% |
| White | 219,437 | 83.7% |
| Black | 3,956 | 1.5% |
| Asian | 5,829 | 2.2% |
| American Indian / Alaska Native | 327 | 0.1% |
| Native Hawaiian / Pacific Islander | 43 | 0.0% |
| Two or More Races | 334 | 0.1% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 182,950 | 91.8% |
| Hispanic | 16,255 | 8.2% |
| White | 172,202 | 86.4% |
| Black | 4,130 | 2.1% |
| Asian | 5,309 | 2.7% |
| American Indian / Alaska Native | 1,110 | 0.6% |
| Native Hawaiian / Pacific Islander | 39 | 0.0% |
| Two or More Races | 175 | 0.1% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
