Woodstock is a far northwest suburb of Chicago in McHenry County, Illinois. The population was 20,151 at the 2000 census. The 2010 Census shows 24,770 residents. It is the county seat of McHenry County. Woodstock is located 51 miles (82 km) northwest of the Chicago Loop and 32 miles (51 km) northwest of O'Hare International Airport.
Woodstock is the home of the historic Woodstock Opera House and Old McHenry County Courthouse. The city was named in 2007 as one of the nation's Dozen Distinctive Destinations 2007 by the National Trust for Historic Preservation.
Woodstock was originally called Centerville to attract the seat of McHenry County in 1842. It changed its name in 1845 to the present Woodstock and was incorporated as a city in 1873. A vital artery for the growing town was the train line, which allowed for a substantial industrial presence early in the town's history.