Total Population in Cook County, IL
ACS 2024 5-Year Estimates
How Cook County Compares
National Distribution
Where Cook County falls among all 3,222 U.S. counties for total population.
■ Cook County: 5,182,090
Ranking Context
| Rank | County | Value |
|---|---|---|
| #1 | Los Angeles County, CA | 9,808,667 |
| #2 | Cook County, IL | 5,182,090 |
| #3 | Harris County, TX | 4,838,303 |
| #4 | Maricopa County, AZ | 4,559,748 |
| #5 | San Diego County, CA | 3,288,774 |
Total Population in Cook County, Illinois
Cook County, Illinois has a total population of 5,182,090, which ranks #2 of 3,222 out of 3,222 counties nationwide. This is 98.4% below the national value of 330M.
Within Illinois, Cook County ranks #1 of 102 out of 102 counties. This places it in the 100th percentile nationally.
Total population count from the American Community Survey. All data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates for 2024.
About this data
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2024). All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.