Total Population in Cook County, IL
ACS 2024 5-Year Estimates
5,182,090
Rank #2/3,222 · #1 in IL
100th
Cook 5,182,090
IL 13M -59.2%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Cook County's total population of 5,182,090 compares to all 3,222 U.S. counties. Values range from 33 to 9,808,667.
Distribution of Total Population Across All Counties
Ranking Context
Counties ranked closest to Cook County for total population.
Nearby Rankings
Full ranking →| #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 |
About Total Population
Cook County, Illinois has a total population of 5,182,090, ranking #2 of 3,222 counties nationwide — 98.4% below the national value of 330M. Within Illinois, it ranks #1 of 102. This places it in the 100th percentile nationally.
Total population count from the American Community Survey. Source: U.S. Census Bureau, American Community Survey 2024 5-Year Estimates. All values are estimates derived from survey samples and are subject to margin of error. For more information, see our methodology.