Total Population in Mercer County, IL
ACS 2024 5-Year Estimates
15,495
Rank #2,126/3,222 · #69 in IL
34th
Mercer 15,495
IL 13M -99.9%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Mercer County's total population of 15,495 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 Mercer County for total population.
Nearby Rankings
Full ranking →| #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 |
About Total Population
Mercer County, Illinois has a total population of 15,495, ranking #2,126 of 3,222 counties nationwide — 100.0% below the national value of 330M. Within Illinois, it ranks #69 of 102. This places it in the 34th 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.