The Williamson County Sheriffs Office has a long and distinct history. The first Sheriff of Williamson County, John d. Sanders, was elected in 1839. The first Sheriffs Office and Jail was purchased in January 8, 1840. On February 19, 2012 the Williamson County Sheriffs Office opened their new state of the art facility located at 404 North Van Buren st. Marion, IL.