Overview
- District ID
- il-hd-045
- State
- Illinois
- Chamber
- Lower chamber
- District Code
- 045
- Land Area
- 29 sq mi
- Water Area
- 0.56 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
Showing all 2 counties
Places
Showing all 13 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 | 79,080 | 72.8% | 10.5% | 74.5% |
| IL District 4 | 25,912 | 23.9% | 3.4% | 22.8% |
| IL District 3 | 3,593 | 3.3% | 0.5% | 2.7% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 84,780
- Active Voters
- 77,404 (91.3%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 21,306 (25.1%) | <10 (—) | <10 (—) |
| 2023–2024 | 58,422 (68.9%) | 8,779 (10.4%) | 5,733 (6.8%) |
| 2021–2022 | 44,122 (52.0%) | 8,646 (10.2%) | 8,893 (10.5%) |
| 2019–2020 | 56,220 (66.3%) | 13,510 (15.9%) | 3,897 (4.6%) |
| 2017–2018 | 43,019 (50.7%) | 10,050 (11.9%) | 7,663 (9.0%) |
| 2015–2016 | 44,153 (52.1%) | 11,815 (13.9%) | 15,096 (17.8%) |
| 2013–2014 | 28,438 (33.5%) | 1,333 (1.6%) | 8,780 (10.4%) |
| 2011–2012 | 34,014 (40.1%) | 2,304 (2.7%) | 9,883 (11.7%) |
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
- 106,574 (± 1,778)
- Median Age
- 42.8
- Median Household Income
- $126,173 (± $3,888)
- High School Graduate or Higher (age 25+)
- 95.6%
- Bachelor's Degree or Higher (age 25+)
- 60.8%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 24,742 | 23.2% |
| 18 to 64 | 60,869 | 57.1% |
| 65 and over | 20,963 | 19.7% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 12,101 | 11.4% |
| White, not Hispanic | 74,100 | 69.5% |
| Black, not Hispanic | 2,610 | 2.4% |
| Asian, not Hispanic | 13,314 | 12.5% |
| American Indian / Alaska Native, not Hispanic | 3 | 0.0% |
| Native Hawaiian / Pacific Islander, not Hispanic | 19 | 0.0% |
| Some other race, not Hispanic | 753 | 0.7% |
| Two or more races, not Hispanic | 3,674 | 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
- 100,179
- Citizen Voting Age Population (CVAP)
- 76,211
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 89,669 | 89.5% |
| Hispanic | 10,512 | 10.5% |
| White | 73,939 | 73.8% |
| Black | 2,457 | 2.5% |
| Asian | 10,769 | 10.7% |
| American Indian / Alaska Native | 1 | 0.0% |
| Native Hawaiian / Pacific Islander | 19 | 0.0% |
| Two or More Races | 367 | 0.4% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 69,541 | 91.2% |
| Hispanic | 6,669 | 8.8% |
| White | 58,425 | 76.7% |
| Black | 2,268 | 3.0% |
| Asian | 8,356 | 11.0% |
| American Indian / Alaska Native | 180 | 0.2% |
| Native Hawaiian / Pacific Islander | 16 | 0.0% |
| Two or More Races | 290 | 0.4% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
