The London Borough of Sutton is a London borough in South West London, England and forms part of Outer London. It covers an area of and is the 80th largest local authority in England by population. It is one of the southernmost boroughs of London. It is south of the London Borough of Merton, west of the London Borough of Croydon and east of the Royal Borough of Kingston Upon Thames. The local authority is Sutton London Borough Council. Its principal town is the eponymous Sutton.