In recent centuries, the county's role in administrative affairs has declined, though the county itself was never abolished. Between 1889 and 1965, a large area of the county was under London County Council (though some suburban areas of London were under Middlesex County Council). Between April 1965 and March 1986, most of the county was under Greater London Council, with the Potters Bar area being under Hertfordshire County Council. Following the abolition of that council (though Greater London remains as a devolved authority, statistical region and for the purposes of lieutenancy), the county of Middlesex is mostly administered by 18 of the 32 London Borough councils and the City of London Corporation, with Potters Bar remaining in the domain of Herefordshire County Council. | In recent centuries, the county's role in administrative affairs has declined, though the county itself was never abolished. Between 1889 and 1965, a large area of the county was under London County Council (though some suburban areas of London were under Middlesex County Council). Between April 1965 and March 1986, most of the county was under Greater London Council, with the Potters Bar area being under Hertfordshire County Council. Following the abolition of that council (though Greater London remains as a devolved authority, statistical region and for the purposes of lieutenancy), the county of Middlesex is mostly administered by 18 of the 32 London Borough councils and the City of London Corporation, with Potters Bar remaining in the domain of Herefordshire County Council. |