Overview
- District ID
- mo-hd-105
- State
- Missouri
- Chamber
- Lower chamber
- District Code
- 105
- Land Area
- 10.1 sq mi
- Water Area
- 0.58 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 | 10.13 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 | 36,927 | 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
- 22,419
- Active Voters
- 20,252 (90.3%)
Party Registration
| Party | Voters | Share |
|---|
| Democratic | 698 | 3.1% |
| Republican | 696 | 3.1% |
| Unaffiliated | 816 | 3.6% |
| Other parties | 31 | 0.1% |
| No party recorded | 20,178 | 90.0% |
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 2,806 (12.5%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 16,253 (72.5%) | 0 (0.0%) | 0 (0.0%) |
| 2021–2022 | 10,662 (47.6%) | 0 (0.0%) | 0 (0.0%) |
| 2019–2020 | 14,763 (65.9%) | 0 (0.0%) | 0 (0.0%) |
| 2017–2018 | 11,604 (51.8%) | 0 (0.0%) | 0 (0.0%) |
| 2015–2016 | 12,522 (55.9%) | 0 (0.0%) | 0 (0.0%) |
| 2013–2014 | 6,378 (28.4%) | 0 (0.0%) | 0 (0.0%) |
| 2011–2012 | 10,819 (48.3%) | 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
- 35,465 (± 1,235)
- Median Age
- 35.4
- Median Household Income
- $75,175 (± $3,335)
- High School Graduate or Higher (age 25+)
- 94.8%
- Bachelor's Degree or Higher (age 25+)
- 41.9%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 5,681 | 16.0% |
| 18 to 64 | 23,552 | 66.4% |
| 65 and over | 6,232 | 17.6% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 2,328 | 6.6% |
| White, not Hispanic | 27,097 | 76.4% |
| Black, not Hispanic | 2,619 | 7.4% |
| Asian, not Hispanic | 1,708 | 4.8% |
| American Indian / Alaska Native, not Hispanic | 34 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 74 | 0.2% |
| Some other race, not Hispanic | 182 | 0.5% |
| Two or more races, not Hispanic | 1,423 | 4.0% |
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
- 33,703
- Citizen Voting Age Population (CVAP)
- 28,185
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 31,861 | 94.5% |
| Hispanic | 1,843 | 5.5% |
| White | 27,213 | 80.7% |
| Black | 2,549 | 7.6% |
| Asian | 965 | 2.9% |
| American Indian / Alaska Native | 33 | 0.1% |
| Native Hawaiian / Pacific Islander | 47 | 0.1% |
| Two or More Races | 29 | 0.1% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 27,002 | 95.8% |
| Hispanic | 1,185 | 4.2% |
| White | 23,687 | 84.0% |
| Black | 2,264 | 8.0% |
| Asian | 839 | 3.0% |
| American Indian / Alaska Native | 157 | 0.6% |
| Native Hawaiian / Pacific Islander | 50 | 0.2% |
| Two or More Races | 20 | 0.1% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
