Lake County, Illinois
From Ancestry.com Wiki
Lake is a county in Illinois. It was formed in 1839 from the following county/ies: McHenry. Lake began keeping birth records in 1877, marriage records in 1839, and death records in 1877. It began keeping land records in 1839, probate records in 1839, and court records in 1840. For more information, contact the county at 18 N. County St., Waukegan 60085. On the attached map, Lake is located at A6.
For information about the state of Illinois see Illinois Family History Research.