Allerdale is a non-metropolitan district of Cumbria, England, with borough status. Its council is based in Workington and the borough has a population of 93,492 according to the 2001 census, increasing to 96,422 at the 2011 Census. The Borough of Allerdale was formed under the Local Government Act 1972, on 1 April 1974 by the merger of the municipal borough of Workington, the urban districts of Maryport, Cockermouth and Keswick; and the rural districts of Cockermouth and Wigton, all of which were within the administrative county of Cumberland. In 1995 Allerdale was granted borough status.