In 2003 the preserved county of Gwent expanded to include the whole of Caerphilly County Borough;[9] the Gwent Police area had already been realigned to these boundaries in 1996. In 2007, the population of this enlarged area was estimated as 560,500,[10] making it the most populous of the preserved counties of Wales.
^Local Government Act 1933 c. 51, First Schedule, Part I (a) Administrative Counties in England: Monmouth; Part II (a) County Boroughs in England: Newport.
^Local Government Act 1972 c. 70, s. 1 New local government areas in England, ss. 12 "In this section 'England' does not include the administrative county of Monmouthshire or the county borough of Newport." & s. 20 New local government areas in Wales, ss. 7 "In this section 'Wales' includes the administrative county of Monmouthshire and the county borough of Newport."
^Williams, Chris (2011). "The Question of Monmouthshire". In Williams, Chris; Williams, Sian Rhiannon (eds.). Industrial Monmouthshire 1780-1914. The Gwent County History. Vol. 4. Cardiff: University of Wales Press. p. 357. ISBN978-0-7083-2365-6. OCLC56570946.