McHenry County, Illinois: History
McHenry County was formed in 1836 out of Cook and LaSalle counties. The county was named for Major William McHenry, a member of the Illinois Militia during Tecumseh's War, a major during the Blackhawk War in 1832, and a member of the Illinois House of Representatives and Senate. He died in Vandalia, Illinois in 1835.
McHenry County originally stretched all the way east to Lake Michigan, with the county seat centrally in McHenry, but in 1839, the eastern townships of the county were carved out forming Lake County.
The Count's House, 3803 Waukegan Rd, McHenry
Charles H. Hibbard House, 413 W Grant Hwy, Marengo
Col. Gustavus A. Palmer House, 5516 Terra Cotta Rd., Crystal Lake
Orson Rogers House, 19621 E Grant Hwy, Marengo
Lucein Boneparte Covell House, 5805 Broadway, Richmond
Memorial Hall, 10308 Main St, Richmond
Old McHenry County Courthouse, Woodstock City Square, Woodstock
Woodstock Opera House, 110 Van Buren St, Woodstock
Woodstock Square Historic District, Woodstock
George Stickney House, 1904 Cherry Valley Rd, Bull Valley
Terwilliger House, Mason Hill Rd & Cherry Valley Rd, Bull Valley