Historic counties of England the Morecambe Bay tidal flats. When the first county councils were set up in 1889, they covered newly created entities known as administrative counties. Several historic subdivisions with separate county administrations were also created administrative counties, particularly the separate ridings of Yorkshire, the separate parts of Lincolnshire, and East and West Sussex. The Local Government Act 1888 also contained wording to create both a new "administrative county" and "county" of London, and to ensure that the county boroughs which were created at the same time continued for non-administrative purposes to be part of the county which they had previously formed
Middlesex East in London city riding. In 1947, it was redefined to consist of the townships of North Dorchester, London, West Nissouri and Westminster, and the eastern part of the City of London. In 1952, it was redefined to consist of the Townships of Dorchester North, Nissouri West, Westminster, the eastern part of the Township of London, and the eastern part of the City of London. The electoral district was abolished in 1966 when it was redistributed between London East, London West and Middlesex ridings. It was re-created in 1976 from parts of Huron—Middlesex, London East and Middlesex—London—Lambton ridings, but was renamed