Date	Political Entity Part Of	Comments
Before Dec. 9, 1778	Illinois Co., VA	Part of land claimed by VA
Dec. 9, 1778	United States	Ceded by VA
Mar. 1, 1784	Northwest Territory
June 2, 1790	Knox Co., Northwest Territory
Feb. 3, 1801	East:  Knox Co., Northwest Territory West:  St. Clair Co., Northwest Territory	Divided along Indian Boundary Line
July 4, 1801	Indiana Territory	(same divisions)
March 1, 1809	Illinois Territory	(same divisions)
April 28, 1809	St. Clair Co., Illinois Territory	Knox Co. abolished
Sept. 14, 1812	Madison Co., Illinois Territory
Nov. 28, 1814	Edwards Co., Illinois Territory
Dec. 31, 1816	Crawford Co., Illinois Territory
Dec. 3, 1818	Crawford Co., IL	Illinois admitted to Union
March 22, 1819	Clark Co., IL	Formed out of Crawford.  At this time, the county limits were from the present south boundary of Clark Co. on the south to the WI state line on the north, and from the midline of IL on the west to the IN state line on the east.

Notes: Compiled by L. K. Ortman