McHenry County's estimated 2026 population is 321,007 with a growth rate of 0.79% in the past year according to the most recent United States census data. McHenry County is the 6th largest county in Illinois. The 2010 population was 309,121 and has seen a growth of 3.85% since that time.
Data after 2023 is projected based on recent change
The racial composition of McHenry County includes 82.45% White, 3.38% other race, and smaller percentages for Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (82.45%)
Two or more races (9.4%)
Other race (3.38%)
Asian (2.91%)
Black or African American (1.56%)
Native American (0.3%)
Native Hawaiian or Pacific Islander (0.01%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 256,708 | 82.45% |
| Two or more races | 29,270 | 9.4% |
| Other race | 10,519 | 3.38% |
| Asian | 9,058 | 2.91% |
| Black or African American | 4,854 | 1.56% |
| Native American | 932 | 0.3% |
| Native Hawaiian or Pacific Islander | 25 | 0.01% |
Married
Widowed
Divorced
Separated
Never Married
McHenry County's average per capita income is $58,562. Household income levels show a median of $102,836. The poverty rate stands at 6.07%.
Name | Median | Mean |
|---|---|---|
| Married Families | $135,532 | $162,384 |
| Families | $121,624 | $146,546 |
| Households | $102,836 | $128,231 |
| Non Families | $55,626 | $73,367 |
Average Income
Median Household Income
Poverty Rate
