The village was named after the now-closed Cemmaes Road railway station on the Newtown and Machynlleth Railway, now part of the Cambrian Line. Cemmaes Road was also the junction with the Mawddwy Railway.
The Welsh-language name for the village, and for the parish is Glantwymyn, meaning "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.
The village of Cemmaes is 1¾ miles to the northeast. Cemmaes Road lies at the junction of the major A470 and 489 roads.
Ysgol Glantwymyn primary school is located in the village.
- The former railway station
- www.geograph.co.uk : photos of Cemmaes Road / Glantwymyn & surrounding area
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