McHenry   County IL United States

County FIPS 17111
Largest City Crystal Lake
State Illinois
Latitude 42.3244
Longitude -88.4523
Population 312,591
Density 518.19 people per square mile
Time Zone America/Chicago
  • All demographic data comes from the 2024 American Community Survey (5-year study).
  • Learn more about each field.
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Household Income

Median household: $104,802
Median individual: $48,103

Race

Mode: 79.5% White

Gender

 50.1% male 

Rent

  $1401 / month  

Median house value: $307,921.0

Age

Median: 40.7 years old

Education

With at least college degree: 35.2%
With STEM degree: 41.6%

Marital Status

 55.2% married 

Never married: 29.2%

Labor Force Participation

 69.7% working 

Unemployed: 4.7%

Average Family Size

 3.13 people 

Commute Time

 30.1 minutes 

Health Care

 4.5% uninsured 

Poverty

 6.2%

All data comes from the SimpleMaps US Counties Database, 2026.

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