About the town » McHenry, McHenry County, Illinois, United States

McHenry is a city in McHenry County, Illinois, United States. In 2005, its population was estimated to be 24,631. The 2010 U.S. census reported the population at 26,992. McHenry was at one time the county seat of McHenry County. McHenry was named for Major William McHenry, an old Indian fighter. McHenry is surrounded by natural lakes and streams, grassy moraine hills, gravel banks, and shallow nutrient-rich peat bogs; remnants of receding glaciers from the last ice age. Moraine Hills State Park and Volo Bog State Natural Area preserve some of these unique natural features.