Overview
- District ID
- il-sd-040
- State
- Illinois
- Chamber
- Upper chamber (state senate)
- District Code
- 040
- Land Area
- 701.7 sq mi
- Water Area
- 6.7 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 4 counties
Places
Showing top 25 of 47 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 | 134,348 | 61.8% | 17.8% | 47.8% |
| IL District 1 | 80,991 | 37.3% | 10.7% | 49.8% |
| IL District 16 | 1,979 | 0.9% | 0.3% | 2.4% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 150,777
- Active Voters
- 143,341 (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 | 24,726 (16.4%) | <10 (—) | <10 (—) |
| 2023–2024 | 94,830 (62.9%) | 11,213 (7.4%) | 9,269 (6.1%) |
| 2021–2022 | 69,523 (46.1%) | 11,979 (7.9%) | 13,022 (8.6%) |
| 2019–2020 | 93,232 (61.8%) | 23,350 (15.5%) | 9,333 (6.2%) |
| 2017–2018 | 67,874 (45.0%) | 17,278 (11.5%) | 8,783 (5.8%) |
| 2015–2016 | 76,786 (50.9%) | 26,337 (17.5%) | 18,174 (12.1%) |
| 2013–2014 | 50,754 (33.7%) | 9,288 (6.2%) | 9,609 (6.4%) |
| 2011–2012 | 61,530 (40.8%) | 8,426 (5.6%) | 8,844 (5.9%) |
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
- 216,164 (± 2,117)
- Median Age
- 38.3
- Median Household Income
- $75,271 (± $2,457)
- High School Graduate or Higher (age 25+)
- 91.3%
- Bachelor's Degree or Higher (age 25+)
- 24.8%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 50,818 | 23.5% |
| 18 to 64 | 131,376 | 60.8% |
| 65 and over | 33,970 | 15.7% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 30,438 | 14.1% |
| White, not Hispanic | 119,214 | 55.1% |
| Black, not Hispanic | 56,466 | 26.1% |
| Asian, not Hispanic | 1,633 | 0.8% |
| American Indian / Alaska Native, not Hispanic | 125 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 7 | 0.0% |
| Some other race, not Hispanic | 837 | 0.4% |
| Two or more races, not Hispanic | 7,444 | 3.4% |
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
- 208,926
- Citizen Voting Age Population (CVAP)
- 158,596
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 184,152 | 88.1% |
| Hispanic | 24,773 | 11.9% |
| White | 121,099 | 58.0% |
| Black | 56,170 | 26.9% |
| Asian | 1,371 | 0.7% |
| American Indian / Alaska Native | 124 | 0.1% |
| Native Hawaiian / Pacific Islander | 5 | 0.0% |
| Two or More Races | 608 | 0.3% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 143,880 | 90.7% |
| Hispanic | 14,711 | 9.3% |
| White | 97,798 | 61.7% |
| Black | 43,494 | 27.4% |
| Asian | 1,628 | 1.0% |
| American Indian / Alaska Native | 765 | 0.5% |
| Native Hawaiian / Pacific Islander | 0 | 0.0% |
| Two or More Races | 383 | 0.2% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
