Overview
- District ID
- ia-sd-031
- State
- Iowa
- Chamber
- Upper chamber (state senate)
- District Code
- 031
- Land Area
- 53.6 sq mi
- Water Area
- 1.78 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 |
|---|
| Black Hawk County | 53.55 sq mi | 100.0% | 9.5% |
Showing all 1 county
Places
| Place | Overlap | Share of district land | Share of place land |
|---|
| Waterloo city | 53.55 sq mi | 100.0% | 86.9% |
Showing all 1 place
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 |
|---|
| IA District 2 | 64,306 | 100.0% | 8.1% | 100.0% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 35,231
- Active Voters
- 27,834 (79.0%)
Party Registration
| Party | Voters | Share |
|---|
| Democratic | 14,396 | 40.9% |
| Republican | 8,160 | 23.2% |
| Unaffiliated | 12,305 | 34.9% |
| Other parties | 370 | 1.1% |
| No party recorded | 0 | 0.0% |
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 10,621 (30.1%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 25,175 (71.5%) | 1,062 (3.0%) | 537 (1.5%) |
| 2021–2022 | 18,650 (52.9%) | 2,861 (8.1%) | 1,581 (4.5%) |
| 2019–2020 | 24,921 (70.7%) | 4,904 (13.9%) | 1,746 (5.0%) |
| 2017–2018 | 17,884 (50.8%) | 2,434 (6.9%) | 529 (1.5%) |
| 2015–2016 | 20,288 (57.6%) | 1,197 (3.4%) | 253 (0.7%) |
| 2013–2014 | 13,744 (39.0%) | 1,612 (4.6%) | 1,129 (3.2%) |
| 2011–2012 | 18,810 (53.4%) | 300 (0.9%) | 658 (1.9%) |
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 01/20/2026. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".
Demographics
- Total Population
- 64,291 (± 493)
- Median Age
- 36.6
- Median Household Income
- $56,662 (± $1,781)
- High School Graduate or Higher (age 25+)
- 89.3%
- Bachelor's Degree or Higher (age 25+)
- 20.9%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 15,493 | 24.1% |
| 18 to 64 | 37,988 | 59.1% |
| 65 and over | 10,810 | 16.8% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 5,580 | 8.7% |
| White, not Hispanic | 41,556 | 64.6% |
| Black, not Hispanic | 10,982 | 17.1% |
| Asian, not Hispanic | 2,091 | 3.3% |
| American Indian / Alaska Native, not Hispanic | 80 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 964 | 1.5% |
| Some other race, not Hispanic | 80 | 0.1% |
| Two or more races, not Hispanic | 2,958 | 4.6% |
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
- 60,411
- Citizen Voting Age Population (CVAP)
- 45,719
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 56,025 | 92.7% |
| Hispanic | 4,385 | 7.3% |
| White | 41,440 | 68.6% |
| Black | 9,841 | 16.3% |
| Asian | 1,650 | 2.7% |
| American Indian / Alaska Native | 80 | 0.1% |
| Native Hawaiian / Pacific Islander | 421 | 0.7% |
| Two or More Races | 454 | 0.8% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 43,609 | 95.4% |
| Hispanic | 2,108 | 4.6% |
| White | 34,573 | 75.6% |
| Black | 7,176 | 15.7% |
| Asian | 1,214 | 2.7% |
| American Indian / Alaska Native | 461 | 1.0% |
| Native Hawaiian / Pacific Islander | 116 | 0.3% |
| Two or More Races | 203 | 0.4% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
