size, rose from 236,266 to 665,347 in the forty years to 1961. The chart of this rise which tapered off, shows by 1951 Middlesex formed part of the London conurbation, and in 1965 the council was abolished on the creation of the Greater London Council. All but four electoral divisions of the council's closing 87 became part of brand-new Greater London; the rest transferred to Surrey as to the two parts of Staines plus Sunbury-on-Thames or to Hertfordshire as to Potters Bar, these were three Urban Districts. References History of local government in Middlesex Former county councils of England 1889 establishments in England 1965 disestablishments in England