Cymmer is also the name of the electoral ward for the immediate area around the village. It elects a county councillor to Neath Port Talbot County Borough Council. The ward includes some or all of the villages of Cymmer, Abercregan, Duffryn and Croeserw in the parliamentary constituency of Aberavon. Cymmer is bounded by the wards of Resolven to the north; Glyncorrwg to the northeast; Gwynfi to the east; Blaengarw, Caerau and Maesteg West of Bridgend county borough to the south east; Bryn and Cwmavon to the southwest; and Pelenna to the west.