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County in Illinois

Lake County

About 714,200 people, median household income $110,400.

District lines run through Lake County, so who represents you here depends on where you live. Search your address to see yours.

Who lives in Lake County

Census survey estimates for 2020 to 2024, rounded.

People

Population
714,200
Median age
39.1 years
Under 18
23%
65 and over
16%
Veterans, of adults
5%
Speak another language at home
31%

Race and ethnicity

Hispanic or Latino, of any race
25%
White, not Hispanic
56%
Black, not Hispanic
6%
Asian, not Hispanic
9%

Income and housing

Median household income
$110,400
Below the poverty line
8%
Bachelor's or higher, adults 25+
48%
Owner-occupied homes
75%
Median home value
$346,000

2024 vote for president

Kamala Harris, Democrat
59.4%
Donald Trump, Republican
38.7%
Other candidates
1.9%

Votes counted, by precinct. Source: MIT Election Data and Science Lab, precinct returns (public domain).

Represent all of Lake County

Lake County's districts (18)

U.S. House (4)

Illinois Senate (5)

Illinois House (9)

Towns (61)

Cities, villages and unincorporated communities, with the number of people in the county’s part of each at the 2020 Census.

37 more towns

Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–2024; towns and counties from the 2020 Census, Demographic and Housing Characteristics. Figures rounded by us. Retrieved 2026-10-19. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.