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The 2009 McHenry County, IL, population is 315,943. There are 517 people per square mile (population density).
The median age is 36.2. The US median is 37.6. 67.55% of people in McHenry County, IL, are married. 8.00% are divorced.
The average household size is 2.85 people. 36.51% of people are married, with children. 6.04% have children, but are single.
92.02% of people are white, 0.93% are black, 2.29% are asian, 0.17% are native american, and 5.06% claim 'Other'.
9.71% of the people in McHenry County, IL, claim hispanic ethnicity (meaning 90.29% are non-hispanic).
McHenry, IL People data
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