 Since the 1965 formation of London boroughs (see Greater London) it mainly corresponds to the London Boroughs of Enfield, a negligible portion of Barnet and a narrow majority of Haringey.Its ancient parish of South Mimms (including the later civil parish of Potters Bar) has since 1965 been part of the Hertsmere district in Hertfordshire.The hundred was listed in the Domesday Book in 1086, after which there were only very minor boundary changes.