Cymmer, Rhondda Cynon Taf

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Cymmer is located in Rhondda Cynon Taf
Location within Rhondda Cynon Taf
Population4,807 (2011)[1]
OS grid referenceST0290
Principal area
Ceremonial county
Sovereign stateUnited Kingdom
Post townPORTH
Postcode districtCF39
Dialling code01443
PoliceSouth Wales
FireSouth Wales
EU ParliamentWales
UK Parliament
Welsh Assembly
List of places
Rhondda Cynon Taf
51°36′54″N 3°23′49″W / 51.61492°N 3.39692°W / 51.61492; -3.39692Coordinates: 51°36′54″N 3°23′49″W / 51.61492°N 3.39692°W / 51.61492; -3.39692

Cymmer (Welsh: Cymer) is a village and community in the Rhondda Valley, Wales. It is so named because of being located at the 'confluence' of the Rhondda Fawr and Rhondda Fach river valleys. Several collieries were opened here in the middle part of the nineteenth century. A serious mine accident in 1856 resulted in 114 casualties, and the lack of payment of any compensation to the miners' families caused bitter feelings in the community.


Cymmer is located in the lower Rhondda Valley about halfway between Treorchy and Pontypridd. It is situated on the A4119 road half a mile from its junction with the A4058 road. Neighbouring settlements are Penygraig, Trealaw, Tonypandy, Dinas Rhondda, Llwyncelyn and Porth. Cymmer comprises the villages of Trehafod, Trebanog, Britannia, Glynfach and Cymmer itself.[2]


George Insole owned the mineral rights to the land at Cymmer. Several collieries were sunk in the vicinity, namely Cymmer Colliery (Old No. 1 Pit) (1847), Glynfach Colliery (1851), New Cymmer Colliery (1855), Upper Cymmer Colliery (1851) and Ty-Newydd Colliery (1852), not to mention the several other collieries of Porth and Trehafod. This was the site of an 1856 mining accident in which 114 people were killed. The official enquiry that followed found that inadequate ventilation had caused a build up of gas, and the jury brought in a verdict of manslaughter. No compensation was paid to the families of the miners concerned. Five of the mine managers went on trial at the spring assizes in 1857; the case against two was dismissed, the judge directed the jury to discharge one of the others and advised them to acquit the remaining two, which they did. The Cymmer community seethed with rancour and the bitter feelings lasted for many years.[3]

The writer and broadcaster Gwyn Thomas (1913–1981) was born and brought up in Cymmer.[4]


An electoral ward in the same name exists. The population of this ward at the 2011 Census was 5,505.[5]


In the early twenty-first century, there were three schools in the village: Cymmer Infant School, Cymmer Junior School and Ysgol Gyfun Y Cymer. However proposals put forward in 2015 would result in the amalgamation of the infant and junior schools, jointly forming a new community primary school utilizing the existing site and buildings.[6]


  1. ^ "Community population 2011". Retrieved 11 November 2015.
  2. ^ Concise Road Atlas of Britain. AA. 2016. p. 27. ISBN 978-0-7495-7743-8.
  3. ^ Carpenter, David J. (2000). Rhondda Collieries. Stroud, Gloucestershire: Tempus Publishing. pp. 42–46. ISBN 0-7524-1730-4.
  4. ^ "Gwyn Thomas". BBC Wales. Archived from the original on 6 August 2010. Retrieved 5 May 2018.
  5. ^ "Ward population 2011". Retrieved 15 November 2015.
  6. ^ Tegeltija, Sam (11 November 2015). "Closure notices issued for Cymmer infants and junior schools as new £2m-boosted school is a step closer". WalesOnline. Retrieved 29 April 2016.

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