Total Population in McHenry County, IL
ACS 2024 5-Year Estimates
How McHenry County Compares
National Distribution
Where McHenry County falls among all 3,222 U.S. counties for total population.
■ McHenry County: 312,591
Ranking Context
| Rank | County | Value |
|---|---|---|
| #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 |
Total Population in McHenry County, Illinois
McHenry County, Illinois has a total population of 312,591, which ranks #233 of 3,222 out of 3,222 counties nationwide. This is 99.9% below the national value of 330M.
Within Illinois, McHenry County ranks #6 of 102 out of 102 counties. This places it in the 93th 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.