Missouri State House District 99

State Legislative District Profile (Lower Chamber)

Overview

District ID
mo-hd-099
State
Missouri
Chamber
Lower chamber
District Code
099
Land Area
14.4 sq mi
Water Area
0.01 sq mi

Boundary

Boundary of Missouri State House District 99

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
St. Louis County14.41 sq mi100.0%2.8%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Ladue city8.56 sq mi59.4%100.0%
Olivette city2.77 sq mi19.2%100.0%
Clayton city2.36 sq mi16.4%94.0%
Warson Woods city0.57 sq mi3.9%100.0%

Showing all 4 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 127,92376.0%3.6%44.3%
MO District 28,81824.0%1.1%55.7%

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

Voters

Registered Voters
26,814
Active Voters
24,133 (90.0%)

Party Registration

PartyVotersShare
Democratic1,2404.6%
Republican4011.5%
Unaffiliated8573.2%
Other parties160.1%
No party recorded24,30090.6%

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20264,524 (16.9%)0 (0.0%)0 (0.0%)
2023–202419,765 (73.7%)0 (0.0%)0 (0.0%)
2021–202215,042 (56.1%)0 (0.0%)0 (0.0%)
2019–202018,532 (69.1%)0 (0.0%)0 (0.0%)
2017–201815,272 (57.0%)0 (0.0%)0 (0.0%)
2015–201615,385 (57.4%)0 (0.0%)0 (0.0%)
2013–20149,314 (34.7%)0 (0.0%)0 (0.0%)
2011–201213,479 (50.3%)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
36,709 (± 696)
Median Age
38.9
Median Household Income
$138,175 (± $9,507)
High School Graduate or Higher (age 25+)
97.5%
Bachelor's Degree or Higher (age 25+)
81.4%

Population by Age

GroupPeopleShare
Under 188,02621.9%
18 to 6422,26160.6%
65 and over6,42217.5%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)1,0502.9%
White, not Hispanic25,11968.4%
Black, not Hispanic3,5909.8%
Asian, not Hispanic4,64012.6%
American Indian / Alaska Native, not Hispanic510.1%
Native Hawaiian / Pacific Islander, not Hispanic00.0%
Some other race, not Hispanic1900.5%
Two or more races, not Hispanic2,0695.6%

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
34,273
Citizen Voting Age Population (CVAP)
26,649

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic33,31897.2%
Hispanic9542.8%
White24,99872.9%
Black3,59610.5%
Asian3,2099.4%
American Indian / Alaska Native530.2%
Native Hawaiian / Pacific Islander10.0%
Two or More Races650.2%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic25,91297.2%
Hispanic7432.8%
White20,09175.4%
Black2,94611.1%
Asian2,73310.3%
American Indian / Alaska Native1050.4%
Native Hawaiian / Pacific Islander20.0%
Two or More Races350.1%

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