Mountain Ash is a community (and former community) in the Cynon Valley, within the Region District of Rhondda Cynon Taf, Wales. At the 2001 census, Mountain Ash had a population of 7,039 boosting to 7,374 at the 2011 Census. The Mountain Ash geographical location integrates and consists of the districts as well as towns of Cefnpennar, Cwmpennar, Caegarw, Darranlas, Fernhill, Glenboi as well as Newtown. Mountain Ash lies within the historical county borders of Glamorgan. The community lies concerning 4.5 miles southern of the community of Aberdare and roughly 19 miles northwest of Cardiff. The village as well as community of Penrhiwceiber lies around a mile south of Mountain Ash. From an administrative point of view, Mountain Ash is divided into two selecting wards: Mountain Ash West takes into account the community centre, together with the districts of Miskin, Darranlas, Fernhill as well as Glenboi; Mountain Ash East consists of the remaining districts of Cefnpennar, Cwmpennar, Caegarw and also Newtown.