Total Population in Mercer County, IL
ACS 2024 5-Year Estimates
How Mercer County Compares
National Distribution
Where Mercer County falls among all 3,222 U.S. counties for total population.
■ Mercer County: 15,495
Ranking Context
| Rank | County | Value |
|---|---|---|
| #2,123 | Carroll County, IL | 15,576 |
| #2,124 | Patillas Municipio, PR | 15,563 |
| #2,125 | Oglethorpe County, GA | 15,509 |
| #2,126 | Mercer County, IL | 15,495 |
| #2,127 | Torrance County, NM | 15,490 |
| #2,128 | Phillips County, AR | 15,450 |
| #2,129 | Hormigueros Municipio, PR | 15,441 |
Total Population in Mercer County, Illinois
Mercer County, Illinois has a total population of 15,495, which ranks #2,126 of 3,222 out of 3,222 counties nationwide. This is 100.0% below the national value of 330M.
Within Illinois, Mercer County ranks #69 of 102 out of 102 counties. This places it in the 34th 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.