Illinois State Senate District 1

State Legislative District Profile (Upper Chamber)

Overview

District ID
il-sd-001
State
Illinois
Chamber
Upper chamber (state senate)
District Code
001
Land Area
24.6 sq mi
Water Area
0.33 sq mi

Boundary

Boundary of Illinois State Senate District 1

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Cook County24.60 sq mi100.0%2.6%

Showing all 1 county

Places

PlaceOverlapShare of district landShare of place land
Chicago city9.09 sq mi36.9%4.0%
Cicero town4.13 sq mi16.8%70.4%
Lyons village2.21 sq mi9.0%100.0%
Brookfield village2.04 sq mi8.3%66.7%
Stickney village1.92 sq mi7.8%100.0%
Berwyn city1.56 sq mi6.3%40.0%
Forest View village1.17 sq mi4.7%100.0%
Riverside village0.72 sq mi2.9%36.3%
McCook village0.66 sq mi2.7%25.2%
Summit village0.01 sq mi<0.1%0.4%

Showing all 10 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
IL District 4208,76996.2%27.7%97.7%
IL District 64,4102.0%0.6%1.5%
IL District 73,8711.8%0.5%0.8%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
109,992
Active Voters
105,869 (96.3%)

Party Registration

This state's voter file does not record party registration.

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–20267,785 (7.1%)0 (0.0%)0 (0.0%)
2023–202458,814 (53.5%)12,131 (11.0%)3,300 (3.0%)
2021–202235,327 (32.1%)12,049 (11.0%)2,951 (2.7%)
2019–202059,662 (54.2%)24,704 (22.5%)1,958 (1.8%)
2017–201842,107 (38.3%)20,986 (19.1%)2,547 (2.3%)
2015–201650,819 (46.2%)29,588 (26.9%)5,380 (4.9%)
2013–201425,706 (23.4%)6,520 (5.9%)2,884 (2.6%)
2011–201234,207 (31.1%)8,448 (7.7%)2,655 (2.4%)

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
209,171 (± 5,523)
Median Age
36.9
Median Household Income
$72,790 (± $2,856)
High School Graduate or Higher (age 25+)
75.1%
Bachelor's Degree or Higher (age 25+)
20.1%

Population by Age

GroupPeopleShare
Under 1851,67324.7%
18 to 64128,60261.5%
65 and over28,89613.8%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)154,52773.9%
White, not Hispanic38,97518.6%
Black, not Hispanic9,0214.3%
Asian, not Hispanic4,4632.1%
American Indian / Alaska Native, not Hispanic1300.1%
Native Hawaiian / Pacific Islander, not Hispanic480.0%
Some other race, not Hispanic3870.2%
Two or more races, not Hispanic1,6200.8%

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
167,797
Citizen Voting Age Population (CVAP)
117,658

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic52,07931.0%
Hispanic115,71669.0%
White38,02822.7%
Black8,9155.3%
Asian3,6092.2%
American Indian / Alaska Native1280.1%
Native Hawaiian / Pacific Islander450.0%
Two or More Races1340.1%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic43,23236.7%
Hispanic74,42463.3%
White32,38027.5%
Black7,0486.0%
Asian3,2912.8%
American Indian / Alaska Native5700.5%
Native Hawaiian / Pacific Islander450.0%
Two or More Races1240.1%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).