Overview
- District ID
- mo-hd-104
- State
- Missouri
- Chamber
- Lower chamber
- District Code
- 104
- Land Area
- 9.81 sq mi
- Water Area
- 0 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
| County | Overlap | Share of district land | Share of county land |
|---|
| St. Charles County | 9.81 sq mi | 100.0% | 1.8% |
Showing all 1 county
Places
Showing all 2 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 |
|---|
| MO District 3 | 36,633 | 100.0% | 4.8% | 100.0% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 26,754
- Active Voters
- 25,210 (94.2%)
Party Registration
| Party | Voters | Share |
|---|
| Democratic | 630 | 2.4% |
| Republican | 712 | 2.7% |
| Unaffiliated | 723 | 2.7% |
| Other parties | 29 | 0.1% |
| No party recorded | 24,660 | 92.2% |
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 4,137 (15.5%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 20,862 (78.0%) | 0 (0.0%) | 0 (0.0%) |
| 2021–2022 | 14,320 (53.5%) | 0 (0.0%) | 0 (0.0%) |
| 2019–2020 | 19,454 (72.7%) | 0 (0.0%) | 0 (0.0%) |
| 2017–2018 | 15,815 (59.1%) | 0 (0.0%) | 0 (0.0%) |
| 2015–2016 | 16,942 (63.3%) | 0 (0.0%) | 0 (0.0%) |
| 2013–2014 | 8,609 (32.2%) | 0 (0.0%) | 0 (0.0%) |
| 2011–2012 | 14,540 (54.3%) | 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
- 37,507 (± 1,486)
- Median Age
- 41.0
- Median Household Income
- $97,853 (± $6,717)
- High School Graduate or Higher (age 25+)
- 96.2%
- Bachelor's Degree or Higher (age 25+)
- 39.3%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 7,518 | 20.0% |
| 18 to 64 | 22,087 | 58.9% |
| 65 and over | 7,902 | 21.1% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 889 | 2.4% |
| White, not Hispanic | 31,884 | 85.0% |
| Black, not Hispanic | 1,667 | 4.4% |
| Asian, not Hispanic | 996 | 2.7% |
| American Indian / Alaska Native, not Hispanic | 2 | 0.0% |
| Native Hawaiian / Pacific Islander, not Hispanic | 4 | 0.0% |
| Some other race, not Hispanic | 121 | 0.3% |
| Two or more races, not Hispanic | 1,944 | 5.2% |
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
- 36,939
- Citizen Voting Age Population (CVAP)
- 29,472
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 36,063 | 97.6% |
| Hispanic | 874 | 2.4% |
| White | 32,580 | 88.2% |
| Black | 1,675 | 4.5% |
| Asian | 715 | 1.9% |
| American Indian / Alaska Native | 3 | 0.0% |
| Native Hawaiian / Pacific Islander | 0 | 0.0% |
| Two or More Races | 134 | 0.4% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 28,761 | 97.6% |
| Hispanic | 707 | 2.4% |
| White | 26,194 | 88.9% |
| Black | 1,731 | 5.9% |
| Asian | 614 | 2.1% |
| American Indian / Alaska Native | 135 | 0.5% |
| Native Hawaiian / Pacific Islander | 0 | 0.0% |
| Two or More Races | 103 | 0.3% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
