Unitary authorities of England

In England, a unitary authority or unitary council is a type of local authority responsible for all local government services in an area. They combine the functions of a non-metropolitan county council and a non-metropolitan district council, which elsewhere in England provide two tiers of local government.

The district that is governed by a unitary authority is commonly referred to as a unitary authority area or unitary area. The terms unitary district and, for those which are coterminous with a county, unitary county are also sometimes used. The term unitary authority is also sometimes used to refer to the area governed, such as in the ISO 3166-2:GB standard defining a taxonomy for subdivisions of the UK, and in colloquial usage.

Unitary authorities are constituted under the Local Government Act 1992, which amended the Local Government Act 1972 to allow the existence of non-metropolitan counties that do not have multiple districts. Most were established during the 1990s, with more created in 2009 and 2019–23. The size of the areas governed by unitary authorities varies greatly; the authorities created in the 1990s were generally created from single districts and covered a single large town or city, while those created since 2009 often cover entire non-metropolitan counties.

In addition to the authorities created under the 1992 act, the term unitary authority has also been used in a broader sense that is inclusive of all single-tier councils, such as those for London boroughs and metropolitan boroughs.