Overview
- District ID
- il-hd-066
- State
- Illinois
- Chamber
- Lower chamber
- District Code
- 066
- Land Area
- 54.7 sq mi
- Water Area
- 1.75 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 11 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 8 | 66,694 | 61.4% | 8.8% | 72.3% |
| IL District 9 | 35,262 | 32.5% | 4.7% | 24.5% |
| IL District 11 | 6,694 | 6.2% | 0.9% | 3.2% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 74,117
- Active Voters
- 69,532 (93.8%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 12,976 (17.5%) | <10 (—) | 716 (1.0%) |
| 2023–2024 | 53,238 (71.8%) | 5,310 (7.2%) | 5,111 (6.9%) |
| 2021–2022 | 36,590 (49.4%) | 6,071 (8.2%) | 7,430 (10.0%) |
| 2019–2020 | 48,139 (65.0%) | 10,767 (14.5%) | 4,847 (6.5%) |
| 2017–2018 | 34,204 (46.1%) | 7,230 (9.8%) | 6,636 (9.0%) |
| 2015–2016 | 36,654 (49.5%) | 9,604 (13.0%) | 11,131 (15.0%) |
| 2013–2014 | 21,236 (28.7%) | 846 (1.1%) | 5,572 (7.5%) |
| 2011–2012 | 27,211 (36.7%) | 1,467 (2.0%) | 6,022 (8.1%) |
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
- 109,065 (± 2,273)
- Median Age
- 39.4
- Median Household Income
- $109,775 (± $3,876)
- High School Graduate or Higher (age 25+)
- 92.5%
- Bachelor's Degree or Higher (age 25+)
- 41.9%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 24,293 | 22.3% |
| 18 to 64 | 68,489 | 62.8% |
| 65 and over | 16,283 | 14.9% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 22,806 | 20.9% |
| White, not Hispanic | 72,162 | 66.2% |
| Black, not Hispanic | 3,186 | 2.9% |
| Asian, not Hispanic | 6,647 | 6.1% |
| American Indian / Alaska Native, not Hispanic | 106 | 0.1% |
| Native Hawaiian / Pacific Islander, not Hispanic | 0 | 0.0% |
| Some other race, not Hispanic | 230 | 0.2% |
| Two or more races, not Hispanic | 3,928 | 3.6% |
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
- 102,703
- Citizen Voting Age Population (CVAP)
- 78,707
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 83,564 | 81.4% |
| Hispanic | 19,143 | 18.6% |
| White | 72,018 | 70.1% |
| Black | 3,151 | 3.1% |
| Asian | 5,649 | 5.5% |
| American Indian / Alaska Native | 107 | 0.1% |
| Native Hawaiian / Pacific Islander | 1 | 0.0% |
| Two or More Races | 359 | 0.3% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 66,777 | 84.8% |
| Hispanic | 11,929 | 15.2% |
| White | 58,260 | 74.0% |
| Black | 3,195 | 4.1% |
| Asian | 4,860 | 6.2% |
| American Indian / Alaska Native | 293 | 0.4% |
| Native Hawaiian / Pacific Islander | 0 | 0.0% |
| Two or More Races | 225 | 0.3% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
