To file for a County Office you will come to the County Clerk's Office in the Buchanan County Courthouse (411 Jules Street, Room 121, St. Joseph, MO 64501). You will file in our office if are running for: Associate Circuit Judge, Presiding County Commissioner, Clerk of the Circuit Court, County Clerk, Recorder of Deeds, County Treasurer, Prosecuting Attorney, County Auditor, and Collector of Revenue. All STATE offices (including Circuit Court Judge) would file in Jefferson City with the Secretary of State's Office.