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McHenry County

County in Illinois
McHenry County is a county located in the U.S. state of Illinois. According to the 2020 Census, it had a population of 310,229, making it the sixth-most populous county in Illinois. Its county seat is Woodstock. Wikipedia
Population: 311,747 (2022)
Largest city: Crystal Lake
Named for: William McHenry
Seat: Woodstock