Missouri State Senate District 12

State Legislative District Profile (Upper Chamber)

Overview

District ID
mo-sd-012
State
Missouri
Chamber
Upper chamber (state senate)
District Code
012
Land Area
9,945.4 sq mi
Water Area
82 sq mi

Boundary

Boundary of Missouri State Senate District 12

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Nodaway County876.96 sq mi8.8%100.0%
Chariton County751.18 sq mi7.6%100.0%
Harrison County722.52 sq mi7.3%100.0%
Carroll County694.62 sq mi7.0%100.0%
Sullivan County647.98 sq mi6.5%100.0%
Linn County615.59 sq mi6.2%100.0%
Daviess County563.28 sq mi5.7%100.0%
Atchison County547.29 sq mi5.5%100.0%
Livingston County532.30 sq mi5.4%100.0%
Gentry County491.42 sq mi4.9%100.0%
Holt County462.69 sq mi4.7%100.0%
Mercer County453.84 sq mi4.6%100.0%
Grundy County435.29 sq mi4.4%100.0%
Andrew County432.63 sq mi4.4%100.0%
Caldwell County426.39 sq mi4.3%100.0%
DeKalb County421.36 sq mi4.2%100.0%
Clinton County418.94 sq mi4.2%100.0%
Worth County266.63 sq mi2.7%100.0%
Buchanan County184.43 sq mi1.9%45.2%

Showing all 19 counties

Places

PlaceOverlapShare of district landShare of place land
Lake Viking CDP7.88 sq mi0.1%100.0%
Chillicothe city7.13 sq mi0.1%100.0%
Cameron city6.86 sq mi0.1%100.0%
Trenton city6.45 sq mi0.1%100.0%
Maryville city6.37 sq mi0.1%98.1%
Bethany city4.44 sq mi<0.1%100.0%
Brookfield city4.27 sq mi<0.1%98.3%
Lathrop city4.19 sq mi<0.1%100.0%
Carrollton city4.17 sq mi<0.1%100.0%
Ravanna CDP3.96 sq mi<0.1%100.0%
Country Club village3.91 sq mi<0.1%100.0%
Agency village3.68 sq mi<0.1%100.0%
Plattsburg city3.60 sq mi<0.1%100.0%
Marceline city3.28 sq mi<0.1%100.0%
Savannah city3.25 sq mi<0.1%99.9%
Rock Port city2.77 sq mi<0.1%100.0%
Gallatin city2.75 sq mi<0.1%100.0%
Albany city2.44 sq mi<0.1%100.0%
Milan city1.77 sq mi<0.1%100.0%
Big Lake village1.66 sq mi<0.1%100.0%
Princeton city1.59 sq mi<0.1%100.0%
Green City city1.43 sq mi<0.1%100.0%
Hamilton city1.42 sq mi<0.1%96.8%
Stanberry city1.40 sq mi<0.1%100.0%
Leisure Lake CDP1.39 sq mi<0.1%100.0%

Showing top 25 of 151 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 6181,905100.0%23.6%100.0%

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

Voters

Registered Voters
123,709
Active Voters
117,597 (95.1%)

Party Registration

PartyVotersShare
Democratic6040.5%
Republican2,9812.4%
Unaffiliated2,6582.1%
Other parties780.1%
No party recorded117,38894.9%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202621,684 (17.5%)0 (0.0%)0 (0.0%)
2023–202490,203 (72.9%)0 (0.0%)0 (0.0%)
2021–202262,167 (50.3%)0 (0.0%)0 (0.0%)
2019–202082,421 (66.6%)0 (0.0%)0 (0.0%)
2017–201863,192 (51.1%)0 (0.0%)0 (0.0%)
2015–201671,398 (57.7%)0 (0.0%)0 (0.0%)
2013–201444,359 (35.9%)0 (0.0%)0 (0.0%)
2011–201261,061 (49.4%)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
181,219 (± 516)
Median Age
41.4
Median Household Income
$65,084 (± $1,432)
High School Graduate or Higher (age 25+)
91.3%
Bachelor's Degree or Higher (age 25+)
21.6%

Population by Age

GroupPeopleShare
Under 1840,40822.3%
18 to 64102,98956.8%
65 and over37,82220.9%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)5,1022.8%
White, not Hispanic166,11891.7%
Black, not Hispanic2,9001.6%
Asian, not Hispanic1,1080.6%
American Indian / Alaska Native, not Hispanic3380.2%
Native Hawaiian / Pacific Islander, not Hispanic480.0%
Some other race, not Hispanic3680.2%
Two or more races, not Hispanic5,2372.9%

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
179,682
Citizen Voting Age Population (CVAP)
139,381

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic175,25997.5%
Hispanic4,4252.5%
White167,63493.3%
Black2,8461.6%
Asian7350.4%
American Indian / Alaska Native3370.2%
Native Hawaiian / Pacific Islander380.0%
Two or More Races2710.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic136,40997.9%
Hispanic2,9692.1%
White131,02994.0%
Black2,8832.1%
Asian7570.5%
American Indian / Alaska Native1,6021.1%
Native Hawaiian / Pacific Islander250.0%
Two or More Races1870.1%

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