Since its establishment in 1950, the Tulsa Health Department serves as the primary public health agency to more than 600,000 Tulsa County residents, including 13 municipalities and four unincorporated areas. The agency is one of two autonomous local health departments in Oklahoma, with statutory public health jurisdiction throughout Tulsa County and the City of Tulsa. THD's mission is to improve the health and well-being of all Tulsa County residents, in order to make Tulsa County the healthiest county in the country. THD was among the first health departments in the U.S. to receive national accreditation through the Public Health Accreditation Board.