Overview
- District ID
- il-hd-108
- State
- Illinois
- Chamber
- Lower chamber
- District Code
- 108
- Land Area
- 1,939.9 sq mi
- Water Area
- 11 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 56 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 | 61,698 | 56.8% | 8.2% | 68.8% |
| IL District 13 | 46,902 | 43.2% | 6.2% | 31.2% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 77,905
- Active Voters
- 75,105 (96.4%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 15,381 (19.7%) | 0 (0.0%) | 0 (0.0%) |
| 2023–2024 | 57,300 (73.6%) | 3,135 (4.0%) | 9,872 (12.7%) |
| 2021–2022 | 44,873 (57.6%) | 3,664 (4.7%) | 12,781 (16.4%) |
| 2019–2020 | 53,029 (68.1%) | 7,406 (9.5%) | 7,939 (10.2%) |
| 2017–2018 | 42,204 (54.2%) | 5,797 (7.4%) | 9,846 (12.6%) |
| 2015–2016 | 44,977 (57.7%) | 8,653 (11.1%) | 17,222 (22.1%) |
| 2013–2014 | 32,757 (42.0%) | 5,314 (6.8%) | 10,495 (13.5%) |
| 2011–2012 | 36,232 (46.5%) | 3,469 (4.5%) | 7,004 (9.0%) |
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 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
- 107,078 (± 1,223)
- Median Age
- 44.0
- Median Household Income
- $80,359 (± $1,730)
- High School Graduate or Higher (age 25+)
- 93.1%
- Bachelor's Degree or Higher (age 25+)
- 26.3%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 22,422 | 20.9% |
| 18 to 64 | 62,137 | 58.0% |
| 65 and over | 22,519 | 21.0% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 1,709 | 1.6% |
| White, not Hispanic | 99,458 | 92.9% |
| Black, not Hispanic | 2,136 | 2.0% |
| Asian, not Hispanic | 433 | 0.4% |
| American Indian / Alaska Native, not Hispanic | 69 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 14 | 0.0% |
| Some other race, not Hispanic | 242 | 0.2% |
| Two or more races, not Hispanic | 3,017 | 2.8% |
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
- 106,738
- Citizen Voting Age Population (CVAP)
- 84,363
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 105,065 | 98.4% |
| Hispanic | 1,675 | 1.6% |
| White | 100,576 | 94.2% |
| Black | 2,116 | 2.0% |
| Asian | 357 | 0.3% |
| American Indian / Alaska Native | 71 | 0.1% |
| Native Hawaiian / Pacific Islander | 9 | 0.0% |
| Two or More Races | 186 | 0.2% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 83,215 | 98.6% |
| Hispanic | 1,150 | 1.4% |
| White | 79,949 | 94.8% |
| Black | 2,030 | 2.4% |
| Asian | 465 | 0.6% |
| American Indian / Alaska Native | 651 | 0.8% |
| Native Hawaiian / Pacific Islander | 9 | 0.0% |
| Two or More Races | 118 | 0.1% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
