Avon County Council was created in 1974.
Avon County Council ended in 1996.
Northumberland County Council was created in 2009.
Oxfordshire County Council was created in 1889.
London County Council was created in 1889.
Berkshire County Council was created in 1974.
Monmouthshire County Council was created in 1996.
Bedfordshire County Council was created in 1889.
Cambridgeshire County Council was created in 1974.
Buckinghamshire County Council was created in 1889.
Surrey County Council was created in 1889.
West Yorkshire County Council was created in 1974.
It used to be in Avon but it is now a City Council in its own right, however some parts are in South Gloucestershire.