Michigan State Senate District 18

State Legislative District Profile (Upper Chamber)

Overview

District ID
mi-sd-018
State
Michigan
Chamber
Upper chamber (state senate)
District Code
018
Land Area
1,546.8 sq mi
Water Area
41.7 sq mi

Boundary

Boundary of Michigan State Senate District 18

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Barry County553.10 sq mi35.8%100.0%
Calhoun County427.39 sq mi27.6%60.5%
Allegan County247.35 sq mi16.0%30.0%
Kent County140.39 sq mi9.1%16.5%
Ionia County106.39 sq mi6.9%18.6%
Kalamazoo County72.16 sq mi4.7%12.8%

Showing all 6 counties

Places

PlaceOverlapShare of district landShare of place land
Battle Creek city42.59 sq mi2.8%99.9%
Marshall city6.43 sq mi0.4%82.6%
Dowling CDP6.08 sq mi0.4%100.0%
Hastings city5.21 sq mi0.3%100.0%
Level Park-Oak Park CDP5.20 sq mi0.3%99.9%
Springfield city3.66 sq mi0.2%100.0%
Wayland city2.96 sq mi0.2%100.0%
Lowell city2.88 sq mi0.2%100.0%
Middleville village2.32 sq mi0.2%95.0%
Delton CDP2.22 sq mi0.1%100.0%
Nashville village2.11 sq mi0.1%100.0%
Hickory Corners CDP2.07 sq mi0.1%100.0%
Brownlee Park CDP2.02 sq mi0.1%100.0%
Otsego city2.01 sq mi0.1%98.8%
Plainwell city1.99 sq mi0.1%96.0%
Caledonia village1.34 sq mi0.1%100.0%
Saranac village1.15 sq mi0.1%100.0%
Climax village1.06 sq mi0.1%100.0%
Athens village1.01 sq mi0.1%100.0%
Tekonsha village0.95 sq mi0.1%96.0%
Lake Odessa village0.89 sq mi0.1%99.9%
Woodland village0.85 sq mi0.1%100.0%
Freeport village0.79 sq mi0.1%100.0%
Martin village0.77 sq mi<0.1%100.0%
Burlington village0.76 sq mi<0.1%99.9%

Showing top 25 of 28 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 4132,49749.4%17.1%27.5%
MI District 2109,02040.6%14.1%51.7%
MI District 526,77410.0%3.5%20.8%

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

Voters

Registered Voters
224,376
Active Voters
214,580 (95.6%)

Party Registration

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

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202615,683 (7.0%)0 (0.0%)0 (0.0%)
2023–2024152,887 (68.1%)0 (0.0%)0 (0.0%)
2021–2022116,397 (51.9%)0 (0.0%)0 (0.0%)
2019–2020135,513 (60.4%)0 (0.0%)0 (0.0%)
2017–201899,744 (44.5%)0 (0.0%)0 (0.0%)
2015–2016108,141 (48.2%)0 (0.0%)0 (0.0%)
2013–201464,513 (28.8%)0 (0.0%)0 (0.0%)
2011–201294,627 (42.2%)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
269,536 (± 643)
Median Age
40.7
Median Household Income
$74,756 (± $1,492)
High School Graduate or Higher (age 25+)
93.3%
Bachelor's Degree or Higher (age 25+)
26.6%

Population by Age

GroupPeopleShare
Under 1861,61522.9%
18 to 64158,47158.8%
65 and over49,45018.3%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)13,3224.9%
White, not Hispanic223,98783.1%
Black, not Hispanic12,0114.5%
Asian, not Hispanic4,5101.7%
American Indian / Alaska Native, not Hispanic6690.2%
Native Hawaiian / Pacific Islander, not Hispanic990.0%
Some other race, not Hispanic1,2660.5%
Two or more races, not Hispanic13,6725.1%

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
264,549
Citizen Voting Age Population (CVAP)
203,834

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic253,13795.7%
Hispanic11,4084.3%
White226,29185.5%
Black12,3854.7%
Asian3,0321.1%
American Indian / Alaska Native6670.3%
Native Hawaiian / Pacific Islander980.0%
Two or More Races6720.3%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic196,79796.5%
Hispanic7,0313.4%
White179,36988.0%
Black11,6955.7%
Asian2,8461.4%
American Indian / Alaska Native2,7241.3%
Native Hawaiian / Pacific Islander690.0%
Two or More Races4000.2%

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