"Blaenrhondda is a village in the county borough of Rhondda Cynon Taf, Wales, lying at the head the Rhondda Fawr valley. Blaenrhondda is a very small village and is part of the community of Treherbert." wikipedia
Transcript of complete name listing for Treherbert and Ystrad-Rhondda, with the parish and hamlets of Ystradyfodwg, Blaen-y-cwm, Blaen-y-Rhondda, Cwmdare, Cwmpark, Llwynpia, Pen-y-griag, Penyrenglyn, Pentre, Ton-pentre-ystrad, Ton-y-pandy, Treorky, Tynewydd and Tynybedw, from Slaters Directory for 1880.
You can see the administrative areas in which Blaenrhondda has been placed at times in the past.
Select one to see a link to a map of that particular area.