County Durham (district): History
Between 1974 and 1 April 2009, County Durham was governed as a two-tier non-metropolitan county, with a county council and district councils. The original eight districts were Chester-le-Street, Darlington, Derwentside, Durham (city), Easington, Sedgefield, Teesdale, and Wear Valley. In 1997 Darlington was removed from the non-metropolitan county and became a separate unitary authority. In 2009 the remaining districts were abolished and replaced by a single district covering the non-metropolitan county, with Durham County Council as the sole local authority.