In organisational terms, Lewes became one of the non-county boroughs within the then Sussex, East county under the Local Government Act 1933. In 1974, Lewes District Council was formed on 1 April 1974 by the Local Government Act 1972, and was a merger of the former borough of Lewes along with Newhaven and Seaford urban districts and Chailey Rural District. The election in 2015 was the first time in which Green Councillors had been elected to the Lewes District Council, all from the wards in the town of Lewes.