Established in 1966, the Arapahoe Library District serves more than 200,000 residents living in Arapahoe County. Arapahoe County and other major suburban counties make up the greater metropolitan area surrounding Denver, Colorado. The Arapahoe Library District operates eight branch libraries, including mobile library services, and a library at the County Detention Center, funded by the Arapahoe County Sheriff's Department. A seven-member Board of Trustees sets the library budget and determines policy.