St Margaret was an ancient parish in the City and Liberty of Westminster and the county of Middlesex.

St Margaret was an ancient parish, governed by a vestry and within the City and Liberty of Westminster.

[2] The two parishes were grouped into the Westminster District in 1855 when they came within the area of responsibility of the Metropolitan Board of Works.

It held a public meeting in 1856, achieved the required two thirds in favour of providing a library and appointed a librarian the same year.

The parish of St Margaret had a detached part of similar size to its west, by the allegiance of a medieval manor, commonly named Kensington Gore and including the northwest of what is today considered Knightsbridge and Kensington Palace.

[7] In times of monasticism and monarchicism, the geographic extent had a maximum of three extra-parochial areas within, namely: Westminster St Margaret and St John was a local act parish and so remained a single unit for administration of the New Poor Law.

[9] The population history is typical for a central district of London, growing until the 19th century and then declining as transport improvements caused movement to the suburbs.