Missouri State Senate District 18

State Legislative District Profile (Upper Chamber)

Overview

District ID
mo-sd-018
State
Missouri
Chamber
Upper chamber (state senate)
District Code
018
Land Area
7,373.5 sq mi
Water Area
90.1 sq mi

Boundary

Boundary of Missouri 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
Macon County801.21 sq mi10.9%100.0%
Audrain County692.25 sq mi9.4%100.0%
Monroe County647.63 sq mi8.8%100.0%
Adair County567.32 sq mi7.7%100.0%
Putnam County517.32 sq mi7.0%100.0%
Lewis County505.02 sq mi6.8%100.0%
Clark County504.61 sq mi6.8%100.0%
Knox County504.01 sq mi6.8%100.0%
Shelby County500.86 sq mi6.8%100.0%
Randolph County482.71 sq mi6.5%100.0%
Ralls County469.79 sq mi6.4%100.0%
Marion County436.92 sq mi5.9%100.0%
Scotland County436.51 sq mi5.9%100.0%
Schuyler County307.31 sq mi4.2%100.0%

Showing all 14 counties

Places

PlaceOverlapShare of district landShare of place land
Hannibal city15.99 sq mi0.2%99.9%
Kirksville city14.39 sq mi0.2%100.0%
Moberly city13.16 sq mi0.2%99.9%
Mexico city12.13 sq mi0.2%99.7%
Macon city6.06 sq mi0.1%100.0%
Palmyra city3.10 sq mi<0.1%100.0%
Monroe City city3.02 sq mi<0.1%99.6%
Shelbina city2.34 sq mi<0.1%99.9%
Huntsville city2.32 sq mi<0.1%100.0%
Canton city2.28 sq mi<0.1%100.0%
Vandalia city2.24 sq mi<0.1%99.8%
Unionville city2.00 sq mi<0.1%100.0%
Rensselaer village1.96 sq mi<0.1%99.7%
St. Francisville CDP1.86 sq mi<0.1%100.0%
La Plata city1.59 sq mi<0.1%100.0%
Kahoka city1.59 sq mi<0.1%99.8%
Memphis city1.56 sq mi<0.1%100.0%
La Grange city1.56 sq mi<0.1%100.0%
Lancaster city1.49 sq mi<0.1%100.0%
Edina city1.31 sq mi<0.1%100.0%
Perry city1.28 sq mi<0.1%92.9%
Plevna CDP1.28 sq mi<0.1%100.0%
Paris city1.26 sq mi<0.1%100.0%
Clarence city1.16 sq mi<0.1%100.0%
Bevier city1.04 sq mi<0.1%100.0%

Showing top 25 of 92 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
MO District 6177,689100.0%23.1%100.0%

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

Voters

Registered Voters
115,661
Active Voters
109,539 (94.7%)

Party Registration

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

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202614,418 (12.5%)0 (0.0%)0 (0.0%)
2023–202482,333 (71.2%)0 (0.0%)0 (0.0%)
2021–202257,242 (49.5%)0 (0.0%)0 (0.0%)
2019–202074,882 (64.7%)0 (0.0%)0 (0.0%)
2017–201858,385 (50.5%)0 (0.0%)0 (0.0%)
2015–201665,020 (56.2%)0 (0.0%)0 (0.0%)
2013–201440,262 (34.8%)0 (0.0%)0 (0.0%)
2011–201255,675 (48.1%)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 01/02/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
176,703
Median Age
39.9
Median Household Income
$60,214 (± $1,276)
High School Graduate or Higher (age 25+)
90.2%
Bachelor's Degree or Higher (age 25+)
20.9%

Population by Age

GroupPeopleShare
Under 1839,78422.5%
18 to 64102,30957.9%
65 and over34,61019.6%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)3,8132.2%
White, not Hispanic159,00590.0%
Black, not Hispanic6,0023.4%
Asian, not Hispanic1,1950.7%
American Indian / Alaska Native, not Hispanic3240.2%
Native Hawaiian / Pacific Islander, not Hispanic1140.1%
Some other race, not Hispanic2420.1%
Two or more races, not Hispanic6,0083.4%

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
174,989
Citizen Voting Age Population (CVAP)
135,402

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic171,56598.0%
Hispanic3,4262.0%
White160,25691.6%
Black5,3523.1%
Asian8280.5%
American Indian / Alaska Native3200.2%
Native Hawaiian / Pacific Islander1170.1%
Two or More Races3900.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic133,50098.6%
Hispanic1,9021.4%
White125,94193.0%
Black5,0963.8%
Asian9970.7%
American Indian / Alaska Native1,3041.0%
Native Hawaiian / Pacific Islander190.0%
Two or More Races2020.1%

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