Cemmaes Road (Welsh: Glantwymyn) is a village in Powys, Wales. The village was named in English after the now-closed Cemmes Road on the Newtown and Machynlleth Railway, now part of the Cambrian Line. Cemmes Road was also the junction with the Mawddwy Railway. The Welsh name for the village, and for the community, is Glantwymyn (English: The Twymyn Riverside), as it lies on the River Twymyn. According to the United Kingdom Census 2001, the population of the village is 1,072, increasing to 1,185 at the 2011 Census. The Ward covers a much larger area and has a population of 2,040 (2011).