Aug 7, 2025 · You can get the most current Census population data for all 102 Illinois counties, sorted from the most populous counties in Illinois to the least, according to the 2024 Population Estimates …

Cook County is the largest county in the state, with a population of 5,222,712. The most recent census shows that its population has decreased by 0.01% since the previous census.

USA: Illinois (Counties and Townships) with population statistics, charts and maps.

Nov 22, 2022 · The most populous county in Illinois is Cook County with 5 million residents. It’s the second most populous county in the United States just behind Los Angeles County.

nry County. Outside the collar counties, counties with relative Democratic strength include Champaign, Rock Island, a St. Clair. Republicans have majorities in the remaining counties and are particularly …

0 1M 2M 3M 4M 5M Cook County, IL Will County, IL Winnebago County, IL Champaign County, IL McLean County, IL Tazewell County, IL DeKalb County, IL Williamson County, IL Grundy County, IL …

Among all Illinois counties, Cook County had the highest population (5.18M), followed by DuPage County (937.14K), and Lake County (718.60K). The chart below shows the top 10 counties, and the …

This report presents projections of population from 2025 to 2035 by age and sex for Illinois, Chicago, and Illinois counties produced for the Certificate of Need (CON) Program.

Illinois (USA): Counties in Incorporated Places with population statistics, charts and maps.

Illinois's counties show varied growth patterns from 2020 to 2025. Kendall County leads with 10.4% annualized growth, followed by Champaign County (4.21%) and Grundy County (2.95%). The largest …