Ratliff Boon marker on the grounds of the Warrick County Courthouse. 1 Court Sq. (bounded by W. Main St. on the north, W. Locust St. on the south, and S. 2nd St. (west) and S. 3rd St. (east). This marker, if it still stands, is probably on the Main St. side. The December 2018 Google maps view shows construction on that side, so it's hard to determine whether or not the memorial is there. Ratliff Boon was the 2nd governor of the state of Indiana. Boonville is named for his father.