McHenry County Address Data
- State: Illinois
- County: McHenry County
- County Seat: Woodstock
- FIPS: 17111
- Founded in: 1836
- Population: 308,570
- Density: 511 Persons/Square Mile
- Area: 603 Square Miles
- Government Type: County
- Authority: Dillon's Rule
- Legislative Body: Board of Commissioners
- Legislative Body Size: 25
- County Contact: 2200 N Seminary Ave
County Government Center
Woodstock, IL 60098-2637
- County site: https://www.co.mchenry.il.us/
- Labor Force: 165,849
- Unemployment Rate: 3.50%
- Gross Domestic Product (GDP): $10.2 B
Top Cities in McHenry County
Major Cities (population)
Neighbor Counties
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Boone County
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Cook County
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Dekalb County
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Kane County
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Lake County
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Kenosha County
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Walworth County