Overview
- District ID
- il-sd-027
- State
- Illinois
- Chamber
- Upper chamber (state senate)
- District Code
- 027
- Land Area
- 42.2 sq mi
- Water Area
- 0.18 sq mi
Boundary
Boundary as GeoJSON
Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.
Counties
| County | Overlap | Share of district land | Share of county land |
|---|
| Cook County | 42.18 sq mi | 100.0% | 4.5% |
Showing all 1 county
Places
Showing all 9 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 5 | 93,360 | 43.0% | 12.4% | 46.7% |
| IL District 8 | 86,948 | 40.0% | 11.5% | 34.5% |
| IL District 9 | 33,599 | 15.5% | 4.5% | 18.2% |
| IL District 3 | 3,245 | 1.5% | 0.4% | 0.6% |
Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).
Voters
- Registered Voters
- 150,593
- Active Voters
- 144,308 (95.8%)
Party Registration
This state's voter file does not record party registration.
Turnout by Cycle
| Cycle | General | Democratic Primary | Republican Primary |
|---|
| 2025–2026 | 28,550 (19.0%) | <10 (—) | 0 (0.0%) |
| 2023–2024 | 98,942 (65.7%) | 15,565 (10.3%) | 7,624 (5.1%) |
| 2021–2022 | 70,080 (46.5%) | 16,346 (10.9%) | 11,811 (7.8%) |
| 2019–2020 | 98,194 (65.2%) | 27,767 (18.4%) | 5,922 (3.9%) |
| 2017–2018 | 71,059 (47.2%) | 21,475 (14.3%) | 12,445 (8.3%) |
| 2015–2016 | 77,476 (51.4%) | 24,698 (16.4%) | 21,646 (14.4%) |
| 2013–2014 | 47,748 (31.7%) | 3,023 (2.0%) | 10,967 (7.3%) |
| 2011–2012 | 60,395 (40.1%) | 6,372 (4.2%) | 12,717 (8.4%) |
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
- 209,038 (± 3,054)
- Median Age
- 41.2
- Median Household Income
- $102,390 (± $2,475)
- High School Graduate or Higher (age 25+)
- 92.2%
- Bachelor's Degree or Higher (age 25+)
- 51.6%
Population by Age
| Group | People | Share |
|---|
| Under 18 | 46,353 | 22.2% |
| 18 to 64 | 124,160 | 59.4% |
| 65 and over | 38,525 | 18.4% |
Population by Race and Hispanic Origin
| Group | People | Share |
|---|
| Hispanic or Latino (any race) | 37,619 | 18.0% |
| White, not Hispanic | 133,396 | 63.8% |
| Black, not Hispanic | 6,214 | 3.0% |
| Asian, not Hispanic | 24,898 | 11.9% |
| American Indian / Alaska Native, not Hispanic | 51 | 0.0% |
| Native Hawaiian / Pacific Islander, not Hispanic | 50 | 0.0% |
| Some other race, not Hispanic | 734 | 0.4% |
| Two or more races, not Hispanic | 6,076 | 2.9% |
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
- 183,616
- Citizen Voting Age Population (CVAP)
- 140,003
Citizen Population by Race/Ethnicity
| Group | Citizens | Share |
|---|
| Non-Hispanic | 155,293 | 84.6% |
| Hispanic | 28,323 | 15.4% |
| White | 128,590 | 70.0% |
| Black | 5,462 | 3.0% |
| Asian | 17,186 | 9.4% |
| American Indian / Alaska Native | 49 | 0.0% |
| Native Hawaiian / Pacific Islander | 46 | 0.0% |
| Two or More Races | 462 | 0.3% |
Citizen Voting Age Population by Race/Ethnicity
| Group | CVAP | Share |
|---|
| Non-Hispanic | 123,324 | 88.1% |
| Hispanic | 16,677 | 11.9% |
| White | 104,076 | 74.3% |
| Black | 4,849 | 3.5% |
| Asian | 13,686 | 9.8% |
| American Indian / Alaska Native | 375 | 0.3% |
| Native Hawaiian / Pacific Islander | 50 | 0.0% |
| Two or More Races | 316 | 0.2% |
Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).
