The London Borough of Sutton ( pronunciation ) is a London borough in South West London, England and forms part of Outer London. It covers an area of 43 km² (17 sq mi) 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.