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McHenry County Illinois Cities/Towns - Algonquin, Bull Valley, Cary, Crystal Lake, Fox River Grove (also in Lake County), Greenwood, Harvard, Hebron, Holiday Hills, Huntley (also in Kane County), Island Lake, Johnsburg, Lake In The Hills, Lakewood, Marengo, McCullom Lake, McHenry, Oakwood Hills, Pistakee Highlands, Prairie Grove, Richmond, Spring Grove, Trout Valley, Union, Wonder Lake, Woodstock (County Seat)

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McHenry County is located in the U.S. state of Illinois. As of 2016, the U.S. Census Bureau estimated the population to be 307,004. Its county seat is Woodstock.

McHenry County was formed in 1836. The county was named for Major William McHenry, an Indian fighter who died in Vandalia in 1835.

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