The London Borough of Ealing is a London Borough in west London, England, and forms a part of Outer London. The London borough was formed in 1965 by the merging the area of the Municipal Borough of Ealing, the Municipal Borough of Southall along with the Municipal Borough of Acton. The London Borough of Ealing borders the London Borough of Hillingdon to the west, the London Borough of Harrow and the London Borough of Brent to the north, the London Borough of Hammersmith and Fulham towards the east and the London Borough of Hounslow towards the south. It covers a total area of about 21.44 square miles.
According to population estimates from the middle of 2014, the borough features a permanent population of about 342118 inhabitants. This makes it the third biggest London Borough in population, and 11th largest in size, covering part of west London as well as a small part of northwest London. Its administrative centre is Ealing Broadway. Other significant centres consist of Acton, Greenford and Southall.
The town is served by many National Rail and London Underground stations. Along with Brentford, the London Borough of Ealing is the setting for much of the action in Robert Rankin's trilogy comedic novels, The Brentford Trilogy, which currently consists of six volumes. Ealing is also the primary setting for 'The Sarah Jane Adventures', being the place of Sarah Jane Smith's house. 330 hectares inside the borough are designated as a part of the Metropolitan Green Belt.