The borough was formed under the London Government Act 1963 in 1965 from the Municipal Borough of Finchley, Municipal Borough of Hendon and the Friern Barnet Urban District of Middlesex and the East Barnet Urban District and Barnet Urban District of Hertfordshire.
The borough was formed under the London Government Act in 1965 by the merger of the Municipal Borough of Mitcham, the Municipal Borough of Wimbledon and the Merton and Morden Urban District, all formerly within Surrey.
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