McHenry County's estimated 2026 population is 319,772 with a growth rate of 0.64% 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 3.45% since that time.
Data after 2023 is projected based on recent change
Overall: 40.7 years
Female: 41.9 years
Male: 39.8 years
There are 241,502 adults, (51,512 of whom are seniors) in McHenry County.
Female: 155,893 (49.9%)
Male: 156,698 (50.1%)
The racial composition of McHenry County includes 79.54% White, 4.59% other race, 3.12% Asian, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 248,630 | 79.54% |
| Two or more races | 33,870 | 10.84% |
| Other race | 14,344 | 4.59% |
| Asian | 9,760 | 3.12% |
| Black or African American | 4,755 | 1.52% |
| Native American | 1,185 | 0.38% |
| Native Hawaiian or Pacific Islander | 47 | 0.02% |
McHenry County's average per capita income is $60,427. Household income levels show a median of $104,802. The poverty rate stands at 6.23%.
Name | Median | Mean |
|---|---|---|
| Married Families | $138,678 | $166,659 |
| Families | $124,289 | $150,233 |
| Households | $104,802 | $130,520 |
| Non Families | $56,610 | $73,188 |
Average Income
Median Household Income
Poverty Rate
