McHenry County, IL Map
Official Census boundary of McHenry County, Illinois (FIPS 17111). Turn on flood zones, contours, land cover and school districts, measure distances, or click any spot to inspect it.
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McHenry County Demographics
Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates.
Population
312,591
Households
117,594
Median household income
$104,802
Median age
40.7 years
Median home value
$308,100
Median gross rent
$1,401/mo
Owner-occupied homes
82.7%
Bachelor's degree or higher
35.2%
Below poverty level
6.2%
Land area
603.4 sq mi
Population density
518 / sq mi