Total Population in McHenry County, IL
ACS 2024 5-Year Estimates
312,591
Rank #233/3,222 · #6 in IL
93th
McHenry 312,591
IL 13M -97.5%
US 330M
Total Population Trend
Rankings →Percentile Rank Over Time
Year-over-Year Population Change
National Distribution
How McHenry County's total population of 312,591 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 McHenry County for total population.
Nearby Rankings
Full ranking →| #230 | Northampton County, PA | 318,580 |
| #231 | Lorain County, OH | 317,129 |
| #232 | Albany County, NY | 317,018 |
| #233 | McHenry County, IL | 312,591 |
| #234 | Cumberland County, ME | 308,827 |
| #235 | Gloucester County, NJ | 306,954 |
| #236 | St. Johns County, FL | 306,934 |
About Total Population
McHenry County, Illinois has a total population of 312,591, ranking #233 of 3,222 counties nationwide — 99.9% below the national value of 330M. Within Illinois, it ranks #6 of 102. This places it in the 93th 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.