Middlesex (UK Parliament constituency)

Middlesex
Former County constituency for the House of Commons
1265–1885
Number of members	two
Replaced by	Brentford, Ealing, Enfield, Harrow, Hornsey, Tottenham and Uxbridge

Middlesex is a former United Kingdom Parliamentary constituency. It was a constituency of the House of Commons of the Parliament of England, then of the Parliament of Great Britain from 1707 to 1800, and finally of the Parliament of the United Kingdom from 1801 to 1885.

This county constituency consisted of the historic county of Middlesex, in south-eastern England, comprising Spelthorne, Colnbrook, and Potters Bar in other modern counties, together with the north, west, and north-west sectors of the present-day Greater London. Its southern boundary was the River Thames.

The county seat returned two Members of Parliament (sometimes referred to by the medieval term of knights of the shire) until 1885. The place of election for the county was at Brentford.

Until 1832 the county franchise was limited to forty shilling freeholders. The decrease in the value of money due to inflation and the expansion of the wealth and population as the urbanised area in the east around London and Westminster grew contributed to gradually expanding the electorate. The county was estimated by Henning to have about 1,660 voters in 1681. Sedgwick estimated about 3,000 electors in the 1715–54 period. Namier and Brook suggested there were about 3,500 county voters in 1754–90. The number had reached about 6,000 by 1790–1820, according to Thorne.

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