Overview
- District ID
- il-sd-015
- State
- Illinois
- Chamber
- Upper chamber (state senate)
- District Code
- 015
- Land Area
- 271.9 sq mi
- Water Area
- 0.83 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 3 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 2 | 172,973 | 79.7% | 23.0% | 87.7% |
| IL District 1 | 42,242 | 19.5% | 5.6% | 12.2% |
| IL District 6 | 1,830 | 0.8% | 0.2% | 0.1% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 166,136
- Active Voters
- 158,710 (95.5%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 29,416 (17.7%) | 6,075 (3.7%) | 0 (0.0%) |
| 2023–2024 | 93,328 (56.2%) | 21,704 (13.1%) | 4,478 (2.7%) |
| 2021–2022 | 66,105 (39.8%) | 22,225 (13.4%) | 5,757 (3.5%) |
| 2019–2020 | 96,923 (58.3%) | 38,371 (23.1%) | 3,980 (2.4%) |
| 2017–2018 | 74,481 (44.8%) | 32,171 (19.4%) | 5,085 (3.1%) |
| 2015–2016 | 85,075 (51.2%) | 46,650 (28.1%) | 9,462 (5.7%) |
| 2013–2014 | 55,775 (33.6%) | 16,514 (9.9%) | 5,137 (3.1%) |
| 2011–2012 | 70,729 (42.6%) | 18,182 (10.9%) | 4,808 (2.9%) |
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 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
- 210,106 (± 3,147)
- Median Age
- 40.0
- Median Household Income
- $70,641 (± $2,427)
- High School Graduate or Higher (age 25+)
- 90.9%
- Bachelor's Degree or Higher (age 25+)
- 26.4%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 49,398 | 23.5% |
| 18 to 64 | 123,372 | 58.7% |
| 65 and over | 37,336 | 17.8% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 30,208 | 14.4% |
| White, not Hispanic | 59,065 | 28.1% |
| Black, not Hispanic | 110,905 | 52.8% |
| Asian, not Hispanic | 2,808 | 1.3% |
| American Indian / Alaska Native, not Hispanic | 281 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 86 | 0.0% |
| Some other race, not Hispanic | 739 | 0.4% |
| Two or more races, not Hispanic | 6,014 | 2.9% |
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
- 202,688
- Citizen Voting Age Population (CVAP)
- 153,436
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 178,121 | 87.9% |
| Hispanic | 24,565 | 12.1% |
| White | 60,038 | 29.6% |
| Black | 110,822 | 54.7% |
| Asian | 2,054 | 1.0% |
| American Indian / Alaska Native | 281 | 0.1% |
| Native Hawaiian / Pacific Islander | 84 | 0.0% |
| Two or More Races | 1,172 | 0.6% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 137,783 | 89.8% |
| Hispanic | 15,650 | 10.2% |
| White | 49,926 | 32.5% |
| Black | 84,887 | 55.3% |
| Asian | 1,864 | 1.2% |
| American Indian / Alaska Native | 884 | 0.6% |
| Native Hawaiian / Pacific Islander | 87 | 0.1% |
| Two or More Races | 437 | 0.3% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
