Overview
- District ID
- il-sd-041
- State
- Illinois
- Chamber
- Upper chamber (state senate)
- District Code
- 041
- Land Area
- 93.2 sq mi
- Water Area
- 2.47 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 3 counties
Places
Showing all 22 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 6 | 123,419 | 56.8% | 16.4% | 44.5% |
| IL District 11 | 72,101 | 33.2% | 9.6% | 41.8% |
| IL District 1 | 16,311 | 7.5% | 2.2% | 11.8% |
| IL District 4 | 5,319 | 2.4% | 0.7% | 1.9% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 174,735
- Active Voters
- 162,192 (92.8%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 34,031 (19.5%) | 2,065 (1.2%) | 481 (0.3%) |
| 2023–2024 | 121,217 (69.4%) | 19,234 (11.0%) | 12,873 (7.4%) |
| 2021–2022 | 92,230 (52.8%) | 19,111 (10.9%) | 18,586 (10.6%) |
| 2019–2020 | 117,690 (67.4%) | 30,715 (17.6%) | 9,453 (5.4%) |
| 2017–2018 | 88,278 (50.5%) | 22,840 (13.1%) | 16,560 (9.5%) |
| 2015–2016 | 92,734 (53.1%) | 25,450 (14.6%) | 29,521 (16.9%) |
| 2013–2014 | 60,077 (34.4%) | 3,412 (2.0%) | 18,267 (10.5%) |
| 2011–2012 | 72,903 (41.7%) | 5,741 (3.3%) | 18,907 (10.8%) |
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
- 216,848 (± 2,449)
- Median Age
- 43.5
- Median Household Income
- $118,946 (± $4,240)
- High School Graduate or Higher (age 25+)
- 95.6%
- Bachelor's Degree or Higher (age 25+)
- 54.7%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 47,276 | 21.8% |
| 18 to 64 | 124,356 | 57.3% |
| 65 and over | 45,216 | 20.9% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 19,752 | 9.1% |
| White, not Hispanic | 160,152 | 73.9% |
| Black, not Hispanic | 7,510 | 3.5% |
| Asian, not Hispanic | 20,950 | 9.7% |
| American Indian / Alaska Native, not Hispanic | 36 | 0.0% |
| Native Hawaiian / Pacific Islander, not Hispanic | 0 | 0.0% |
| Some other race, not Hispanic | 1,234 | 0.6% |
| Two or more races, not Hispanic | 7,214 | 3.3% |
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
- 204,360
- Citizen Voting Age Population (CVAP)
- 158,028
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 187,132 | 91.6% |
| Hispanic | 17,226 | 8.4% |
| White | 158,441 | 77.5% |
| Black | 7,439 | 3.6% |
| Asian | 16,405 | 8.0% |
| American Indian / Alaska Native | 37 | 0.0% |
| Native Hawaiian / Pacific Islander | 0 | 0.0% |
| Two or More Races | 413 | 0.2% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 146,480 | 92.7% |
| Hispanic | 11,545 | 7.3% |
| White | 125,418 | 79.4% |
| Black | 6,400 | 4.0% |
| Asian | 14,015 | 8.9% |
| American Indian / Alaska Native | 619 | 0.4% |
| Native Hawaiian / Pacific Islander | 0 | 0.0% |
| Two or More Races | 262 | 0.2% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
