Mayfair is a place in London, England in the City of Westminster, named after the fortnight-long May Fair that took place there from 1686 until its was banned in that location in 1764. Prior to 1686, the May Fair was held in the Haymarket[?], and after 1764, it moved to Fair Field in Bow.
... households out of which 28.9% have children under the age of 18 living with them, 42.6% are married couples living together, 11.9% have a female householder with no husband ...