Illinois Regional Archives Depository (IRAD) System Illinois State Archives

Williamson County

Williamson County Courthouse Contact Information
Williamson County Courthouse
200 W. Jefferson
Marion, IL 62959
618-998-2110 – County Clerk
618-997-1301 – Circuit Clerk
618-998-2110 – Recorder

IRAD—c/o Records Management
Morris Library, Mail Code 6808
Southern Illinois University
1835 University Press Dr.
Carbondale, IL 62901-6808


Origin of the name of the county

Present area, or parts of it, formerly included in

County Seats

History of county governing board

Documented Record Losses

Township Government

Township Names (1907–1932)

Township Map

Williamson County Township Map

Pertinent Databases