Swansea included land around Swansea Bay as far as the River Tawe, the manor of Kilvey beyond the Tawe, and the peninsula itself. Swansea was designated chief town of the lordship and received a borough charter at some point between 1158 and 1184 (and a more elaborate one in 1304). From the early 1700s to the late 1800s, Swansea was the world’s leading copper-smelting area. Numerous smelters along the River Tawe received copper and other metal ores shipped from Cornwall and Devon, as well as from North and South America, Africa, and Australia. The industry declined severely in the late 1800s,
Swansea in 1969, which was inherited by the Swansea district when it was formed by the merger of the borough and Gower Rural District in 1974. In 1996, Swansea became one of 22 unitary authorities with the addition of part of the former Lliw Valley Borough. The new authority received the name 'City and County of Swansea' (). Swansea was once a staunch stronghold of the Labour Party which, until 2004, had overall control of the council for 24 years. The Liberal Democrats were the largest group in the administration that took control of Swansea Council in the 2004 local elections