Total Population in St. Clair County, IL
ACS 2024 5-Year Estimates
How St. Clair County Compares
National Distribution
Where St. Clair County falls among all 3,222 U.S. counties for total population.
■ St. Clair County: 253,694
Ranking Context
| Rank | County | Value |
|---|---|---|
| #281 | Washington County, AR | 256,765 |
| #282 | Sussex County, DE | 255,626 |
| #283 | Jefferson County, TX | 253,878 |
| #284 | St. Clair County, IL | 253,694 |
| #285 | Chesapeake city, VA | 252,583 |
| #286 | Union County, NC | 250,958 |
| #287 | Canyon County, ID | 250,790 |
Total Population in St. Clair County, Illinois
St. Clair County, Illinois has a total population of 253,694, which ranks #284 of 3,222 out of 3,222 counties nationwide. This is 99.9% below the national value of 330M.
Within Illinois, St. Clair County ranks #9 of 102 out of 102 counties. This places it in the 91th 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.