Knox (1790-1809) County, Illinois

History
Knox County, Northwest Territory, established June 20, 1790, later Knox County, Indiana Territory, 1800; its boundaries in 1795 included the eastern half of the future state of Illinois. Portions of Knox County would be transferred to Michigan Territory upon its organization in 1805 and to Illinois Territory upon its organization in 1809; the remainder was included in the state of Indiana upon its achieving statehood in 1816. .