Glamorgan County Council was established in 1889 together with the administrative county of Glamorganshire under the Local Government Act 1888. The first elections to the council were held in January 1889. The council was abolished under the Local Government Act 1972 on 1 April 1974. It was replaced by Mid Glamorgan County Council, South Glamorgan County Council and West Glamorgan County Council.

Mid Glamorgan County Council was the upper-tier authority for the Welsh county of Mid Glamorgan between its creation in 1974 and its abolition in 1996.