Harrow is the 12th largest London Borough in terms of geographical area. Harrow was formed in 1934 as an urban district of Middlesex by the Middlesex Review Order, as a merger of the former area of Harrow on the Hill Urban District, Hendon Rural District and Wealdstone Urban District. The local authority was Harrow Urban District Council. The urban district gained the status of Municipal Borough on 4 May 1954 and the urban district council became Harrow Borough Council. In 1965 the Municipal Borough was abolished and its former area transferred to Greater London to form the London Borough of Harrow. It is uniquely the only London borough to replicate exactly the unchanged boundaries of a single former district. 22% of Harrow’s population identify themselves as ‘Indian’ in ethnicity, the highest in London. The largest Hindu communities in London are in Harrow and Wembley.