Overview
- District ID
- il-hd-115
- State
- Illinois
- Chamber
- Lower chamber
- District Code
- 115
- Land Area
- 1,978 sq mi
- Water Area
- 53.6 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 6 counties
Places
Showing top 25 of 39 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 12 | 108,630 | 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
- 80,947
- Active Voters
- 76,361 (94.3%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 10,794 (13.3%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 56,025 (69.2%) | 2,558 (3.2%) | 12,176 (15.0%) |
| 2021–2022 | 42,867 (53.0%) | 2,950 (3.6%) | 11,824 (14.6%) |
| 2019–2020 | 52,061 (64.3%) | 7,012 (8.7%) | 8,408 (10.4%) |
| 2017–2018 | 41,268 (51.0%) | 5,580 (6.9%) | 6,794 (8.4%) |
| 2015–2016 | 44,822 (55.4%) | 8,262 (10.2%) | 15,174 (18.7%) |
| 2013–2014 | 32,286 (39.9%) | 5,721 (7.1%) | 7,139 (8.8%) |
| 2011–2012 | 37,130 (45.9%) | 4,708 (5.8%) | 6,229 (7.7%) |
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
- 107,635 (± 721)
- Median Age
- 43.0
- Median Household Income
- $74,599 (± $1,812)
- High School Graduate or Higher (age 25+)
- 90.5%
- Bachelor's Degree or Higher (age 25+)
- 23.7%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 22,259 | 20.7% |
| 18 to 64 | 62,928 | 58.5% |
| 65 and over | 22,448 | 20.9% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 3,410 | 3.2% |
| White, not Hispanic | 95,006 | 88.3% |
| Black, not Hispanic | 5,389 | 5.0% |
| Asian, not Hispanic | 464 | 0.4% |
| American Indian / Alaska Native, not Hispanic | 75 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 22 | 0.0% |
| Some other race, not Hispanic | 359 | 0.3% |
| Two or more races, not Hispanic | 2,910 | 2.7% |
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
- 106,653
- Citizen Voting Age Population (CVAP)
- 84,541
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 103,843 | 97.4% |
| Hispanic | 2,804 | 2.6% |
| White | 95,607 | 89.6% |
| Black | 5,386 | 5.1% |
| Asian | 297 | 0.3% |
| American Indian / Alaska Native | 72 | 0.1% |
| Native Hawaiian / Pacific Islander | 24 | 0.0% |
| Two or More Races | 430 | 0.4% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 82,608 | 97.7% |
| Hispanic | 1,933 | 2.3% |
| White | 76,334 | 90.3% |
| Black | 5,314 | 6.3% |
| Asian | 383 | 0.5% |
| American Indian / Alaska Native | 469 | 0.6% |
| Native Hawaiian / Pacific Islander | 22 | 0.0% |
| Two or More Races | 97 | 0.1% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
