Total Population in Williamson County, IL
ACS 2024 5-Year Estimates
66,876
Rank #820/3,222 · #22 in IL
75th
Williamson 66,876
IL 13M -99.5%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How Williamson County's total population of 66,876 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 Williamson County for total population.
Nearby Rankings
Full ranking →| #817 | Trujillo Alto Municipio, PR | 67,088 |
| #818 | Aroostook County, ME | 67,058 |
| #819 | St. Francois County, MO | 66,999 |
| #820 | Williamson County, IL | 66,876 |
| #821 | Chippewa County, WI | 66,799 |
| #822 | Ionia County, MI | 66,574 |
| #823 | Jones County, MS | 66,472 |
About Total Population
Williamson County, Illinois has a total population of 66,876, ranking #820 of 3,222 counties nationwide — 100.0% below the national value of 330M. Within Illinois, it ranks #22 of 102. This places it in the 75th 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.