The government of Knox County, Tennessee operates under a home rule format. The county administrator, formerly known as the County Executive, is called the County Mayor. There is also an elected County Commission. The county officials' districts do not correspond with those of the city of Knoxville, which has its own mayor and city council. Residents of the county living within Knoxville city limits vote in both city and county elections, are represented by city and county mayors, and pay city and county taxes. While the administration appears to be duplicated, services tend to be separated. Knox County runs the local school system, health department and library branches. Knoxville maintains police department independent of the County Sheriff. Other Knox County elected offices include the Property Assessor, County Clerk, Register of Deeds, Trustee, District Attorney General, Law Director, Public Defender and court clerks.