Overview
- District ID
- il-sd-048
- State
- Illinois
- Chamber
- Upper chamber (state senate)
- District Code
- 048
- Land Area
- 517.3 sq mi
- Water Area
- 14.4 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 21 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 13 | 172,000 | 79.2% | 22.8% | 35.9% |
| IL District 15 | 45,156 | 20.8% | 6.0% | 64.1% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 162,034
- Active Voters
- 145,167 (89.6%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 24,444 (15.1%) | <10 (—) | <10 (—) |
| 2023–2024 | 98,528 (60.8%) | 8,481 (5.2%) | 9,937 (6.1%) |
| 2021–2022 | 75,094 (46.3%) | 10,363 (6.4%) | 16,142 (10.0%) |
| 2019–2020 | 95,557 (59.0%) | 18,341 (11.3%) | 8,575 (5.3%) |
| 2017–2018 | 75,987 (46.9%) | 14,547 (9.0%) | 12,726 (7.9%) |
| 2015–2016 | 81,403 (50.2%) | 18,788 (11.6%) | 25,197 (15.6%) |
| 2013–2014 | 55,059 (34.0%) | 5,408 (3.3%) | 15,521 (9.6%) |
| 2011–2012 | 67,835 (41.9%) | 6,010 (3.7%) | 12,159 (7.5%) |
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
- 213,426 (± 1,664)
- Median Age
- 39.9
- Median Household Income
- $63,134 (± $1,977)
- High School Graduate or Higher (age 25+)
- 93.0%
- Bachelor's Degree or Higher (age 25+)
- 31.7%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 46,011 | 21.6% |
| 18 to 64 | 126,307 | 59.2% |
| 65 and over | 41,108 | 19.3% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 7,548 | 3.5% |
| White, not Hispanic | 150,580 | 70.6% |
| Black, not Hispanic | 37,769 | 17.7% |
| Asian, not Hispanic | 4,685 | 2.2% |
| American Indian / Alaska Native, not Hispanic | 123 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 63 | 0.0% |
| Some other race, not Hispanic | 1,261 | 0.6% |
| Two or more races, not Hispanic | 11,397 | 5.3% |
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
- 209,223
- Citizen Voting Age Population (CVAP)
- 163,696
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 202,784 | 96.9% |
| Hispanic | 6,434 | 3.1% |
| White | 151,954 | 72.6% |
| Black | 37,667 | 18.0% |
| Asian | 3,147 | 1.5% |
| American Indian / Alaska Native | 123 | 0.1% |
| Native Hawaiian / Pacific Islander | 96 | 0.0% |
| Two or More Races | 1,044 | 0.5% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 159,573 | 97.5% |
| Hispanic | 4,126 | 2.5% |
| White | 125,764 | 76.8% |
| Black | 29,322 | 17.9% |
| Asian | 2,651 | 1.6% |
| American Indian / Alaska Native | 1,420 | 0.9% |
| Native Hawaiian / Pacific Islander | 94 | 0.1% |
| Two or More Races | 548 | 0.3% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
