Successor parishes are civil parishes with a parish council created by the Local Government Act 1972 in England. They replaced, with the same boundaries, a selected group of urban districts and municipal boroughs that were abolished in 1974. Most successor parish councils exercised the right to call themselves towns. A total of 300 successor parishes were formed from the former area of 78 municipal boroughs and 221 urban districts. Civil parishes are not permitted to cross district or county boundaries, and where the creation of a successor parish would cause this to happen, either only part of the former area became a parish or two parishes were formed.