Hillsborough County Sheriff's Office (HCSO) is the primary law enforcement agency for Hillsborough County, Florida and is responsible for law enforcement services for the 888 square miles (2,300 km²) of unincorporated areas of the county as well as operation of the two jail facilities and a work release center, and provides courthouse security for the 13th Judicial Circuit. Each of the three incorporated cities has its own police agency. Tampa International Airport and the University of South Florida also have independent police agencies.