Greater London is a county of England that is located within the London region. This region forms the administrative boundaries of London and is organised into 33 local government districts—the 32 London boroughs and the City of London, which is located within the region but is separate from the county. The Greater London Authority, based in Southwark, is responsible for strategic local government across the region and consists of the Mayor of London and the London Assembly. The City of London Corporation is responsible for the local government of only the City of London.
Administratively, Greater London was first established as a sui generis council area under the Greater London Council between 1963 and 1986. The county of Greater London was created on 1 April 1965 through the London Government Act 1963. The area was re-established as a region in 1994. The Greater London Authority was formed in 2000.
The region covers 1,572 km2 (607 sq mi) and had a population of 8,174,000 at the 2011 census. The Greater London Built-up Area is used in some national statistics and is a measure of the continuous urban area and includes areas outside the administrative region.