Cardiff was a parliamentary constituency centred on the town of Cardiff in South Wales which returned one Member of Parliament to the House of Commons from 1542 until it was abolished for the 1918 general election.

Swansea District before 1885 also known as Swansea District of Boroughs was a borough constituency. It was represented in the House of Commons of the Parliament of the United Kingdom. It elected one Member of Parliament (MP) by the first past the post system of election.