Total Population in Rock Island County, IL
ACS 2024 5-Year Estimates
142,757
Rank #474/3,222 · #14 in IL
85th
Rock Island 142,757
IL 13M -98.9%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Rock Island County's total population of 142,757 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 Rock Island County for total population.
Nearby Rankings
Full ranking →| #471 | Schuylkill County, PA | 143,558 |
| #472 | Sumter County, FL | 143,408 |
| #473 | Grayson County, TX | 143,337 |
| #474 | Rock Island County, IL | 142,757 |
| #475 | Monroe County, IN | 140,965 |
| #476 | Warren County, KY | 140,918 |
| #477 | Cache County, UT | 140,046 |
About Total Population
Rock Island County, Illinois has a total population of 142,757, ranking #474 of 3,222 counties nationwide — 100.0% below the national value of 330M. Within Illinois, it ranks #14 of 102. This places it in the 85th 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.