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About McHenry

McHenry is a city in McHenry County, Illinois, United States. The 2010 U.S. census reported its population at 26,992 and rests at an elevation of 797 feet. McHenry was at one time the county seat of McHenry County, which once included adjoining Lake County to the east. McHenry took its name from McHenry County, which was named for Major William McHenry, a prominent officer in the Black Hawk War.

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