Isleworth is an area in West London. It consists of two wards (urban and suburban) and a small part of a third. It was an early Saxon parish, heavily farmed at the Norman Conquest. It begins east of the town of Hounslow which has more retail and offices, in the borough of that name; west of the River Thames; north of its tributary and the northern confluence of the Crane; and south of the crest by the M4 motorway separating the Brent and Crane catchments. Significant small areas of commerce are clustered on the Golden Mile of the A4/A30 and toward the southern borders, near to the A316. The north is served by two tube stations and the south by a railway station.
A longstanding nucleus of settlement much alongside the Thames is known as 'Old Isleworth'. The north-west corner of the town, rising into Osterley, is of lower density, within its traditional boundaries and its post town; in between this area and Old Isleworth are Spring Grove and Woodlands, residential neighbourhoods.
Isleworth's boundary with the Thames has become reduced to a conservation area including the medieval church and pub on its short promenade facing the large tree-lined islet of Isleworth Ait and Kew Gardens. This line of buildings and the network of short streets and squares leading to it were the home of Georgian scientist Joseph Banks and four painters in the world's major galleries such as Vincent Van Gogh and JMW Turner. This adjoins Syon Park (formed partly from land in Brentford) the direct successor to Isleworth's manor and the impetus for the Duke of Northumberland's River.
Isleworth is one of the ancient parishes of Middlesex. The town of Hounslow straddled both Isleworth and the neighbouring parish of Heston. From 1894 Isleworth parish was part of the Heston and Isleworth Urban District, which was elevated to Municipal Borough status in 1932. In 1965 Heston and Isleworth Municipal Borough was abolished, becaming part of the London Borough of Hounslow.