McHenry County, IL — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
311,366
Male
155,872
50.1%
Female
155,494
49.9%
Median Age
40.4 yrs
Avg Household Size
2.7
Foreign Born
9.3%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher24.2%
High School or Higher42.7%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
4.3%
Disability
0.0%
Non-English Home
4.3%
Married
46.0%
McHenry County, IL has a population of 311,366 according to 2023 Census Bureau estimates. The median age is 40.4 years. The largest racial or ethnic group is White at 82.5% of the population. 24.2% of residents hold a bachelor's degree or higher. 9.3% of residents are foreign-born.