The London Borough of Ealing is a London Borough in west London, England, and forms 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 and the Municipal Borough of Acton. The London Borough of Ealing borders the London Borough of Hillingdon towards the west, the London Borough of Harrow along with the London Borough of Brent towards the north, the London Borough of Hammersmith and Fulham to the east as well as the London Borough of Hounslow towards the south. It covers a total area of about 21.44 square miles.
As recorded in population estimates from the middle of 2014, the borough features a permanent population of around 342118 inhabitants. This makes it the 3rd largest London Borough in population, and 11th biggest in size, covering a part of west London plus a small part of northwest London. Its administrative centre is Ealing Broadway. Other major centres include Acton, Greenford and Southall.
The town is served by many National Rail and London Underground stations. In addition to Brentford, the London Borough of Ealing is the setting for a great deal of the action in Robert Rankin's trilogy comedic novels, The Brentford Trilogy, which at present includes six volumes. Ealing is also the main setting for 'The Sarah Jane Adventures', being the place of Sarah Jane Smith's residence. 330 hectares within the borough are designated as part of the Metropolitan Green Belt.