McHenry is a city in McHenry County, Illinois, United States. It is located about 46 miles northwest of Chicago. Per the 2020 census, the population was 27,135. 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 the county, which was named for Major William McHenry, a prominent US Army officer in the Black Hawk War.
Country: United States
State: Illinois
County: McHenry
Founded: May 10, 1836
Elevation: 797 ft (243 m)
Area codes: 815 and 779
Townships: McHenry Township, Nunda Township, Grant Township, Wauconda Township.
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