Overview
- District ID
- il-hd-099
- State
- Illinois
- Chamber
- Lower chamber
- District Code
- 099
- Land Area
- 1,533.2 sq mi
- Water Area
- 23.6 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 5 counties
Places
Showing top 25 of 29 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 |
|---|
| IL District 15 | 108,582 | 100.0% | 14.4% | 100.0% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 75,325
- Active Voters
- 71,665 (95.1%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 13,314 (17.7%) | 148 (0.2%) | 3,390 (4.5%) |
| 2023–2024 | 48,796 (64.8%) | 1,964 (2.6%) | 9,533 (12.7%) |
| 2021–2022 | 38,143 (50.6%) | 3,007 (4.0%) | 15,464 (20.5%) |
| 2019–2020 | 46,297 (61.5%) | 5,582 (7.4%) | 11,141 (14.8%) |
| 2017–2018 | 35,046 (46.5%) | 3,329 (4.4%) | 8,303 (11.0%) |
| 2015–2016 | 39,374 (52.3%) | 5,165 (6.9%) | 16,373 (21.7%) |
| 2013–2014 | 29,171 (38.7%) | 1,835 (2.4%) | 9,011 (12.0%) |
| 2011–2012 | 32,752 (43.5%) | 1,804 (2.4%) | 8,587 (11.4%) |
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 12/15/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".
Demographics
- Total Population
- 108,025 (± 679)
- Median Age
- 40.8
- Median Household Income
- $66,098 (± $1,921)
- High School Graduate or Higher (age 25+)
- 90.6%
- Bachelor's Degree or Higher (age 25+)
- 25.0%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 22,730 | 21.0% |
| 18 to 64 | 63,641 | 58.9% |
| 65 and over | 21,654 | 20.0% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 5,535 | 5.1% |
| White, not Hispanic | 91,872 | 85.0% |
| Black, not Hispanic | 5,237 | 4.8% |
| Asian, not Hispanic | 828 | 0.8% |
| American Indian / Alaska Native, not Hispanic | 83 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 98 | 0.1% |
| Some other race, not Hispanic | 194 | 0.2% |
| Two or more races, not Hispanic | 4,178 | 3.9% |
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
- 106,135
- Citizen Voting Age Population (CVAP)
- 83,634
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 101,801 | 95.9% |
| Hispanic | 4,340 | 4.1% |
| White | 92,342 | 87.0% |
| Black | 5,071 | 4.8% |
| Asian | 638 | 0.6% |
| American Indian / Alaska Native | 86 | 0.1% |
| Native Hawaiian / Pacific Islander | 30 | 0.0% |
| Two or More Races | 124 | 0.1% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 80,967 | 96.8% |
| Hispanic | 2,665 | 3.2% |
| White | 74,161 | 88.7% |
| Black | 5,137 | 6.1% |
| Asian | 757 | 0.9% |
| American Indian / Alaska Native | 899 | 1.1% |
| Native Hawaiian / Pacific Islander | 28 | 0.0% |
| Two or More Races | 72 | 0.1% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
