Tothill Fields was an 18th-century area of Westminster in the county of Middlesex, a historic county in south-east region of England that ceased to exist in 1790.
Tothill Fields was an 18th-century area of Westminster in the county of Middlesex that lay south of St James's Park on the north bank of the river Thames. 
Middlesex ( , abbreviation: Middx) is a historic county in south-east England. 
