McHenry County, Illinois
McHenry County is a county in the U.S. state of Illinois. In the 2020 census, 310,229 people lived there.[1] The county seat is Woodstock. It is the sixth-most populous county in Illinois.
McHenry County was founded in 1836 and named for William McHenry.
References
- "QuickFacts: McHenry County, Illinois". United States Census Bureau. Retrieved August 11, 2023.
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