Administrative Boundary of Merthyr Tydfil

About Merthyr Tydfil

Merthyr Tydfil (Merthyr Tudful) is a principal area in south Wales, at the head of the Taff valley in the historic county of Glamorgan. Covering approximately 111 square kilometres — the smallest principal area in Wales by population — Merthyr Tydfil had a population of approximately 59,000 at the 2022 Census. The Iron Capital of the World In the early 19th century, Merthyr Tydfil was the largest iron-producing town in the world, its Cyfarthfa Ironworks — founded in 1765 and expanded under ironmaster Richard Crawshay into the largest ironworks on Earth by the early 1800s — drawing a rapidly growing population that briefly made Merthyr the largest town in Wales. Cyfarthfa Castle, an extravagant mock-Gothic mansion built in 1824–25 by ironmaster William Crawshay II overlooking his works and the town below, now houses a museum and art gallery telling the story of this industrial dominance. In 1804, the engineer Richard Trevithick used the world's first successful steam-powered railway locomotive to haul a load along the Penydarren tramroad from Merthyr to Abercynon, a foundational moment in the history of rail transport. The Merthyr Rising and the Labour Movement Merthyr Tydfil holds a central place in the history of the British labour movement: the Merthyr Rising of 1831, in which workers protesting wage cuts and unemployment briefly took control of the town, is remembered both for the martyrdom of Dic Penderyn, controversially executed for wounding a soldier during the unrest, and for the first recorded use of a red flag as a symbol of working-class protest. In 1900, Merthyr Tydfil (as part of the Merthyr Boroughs constituency) elected Keir Hardie, founder of the Labour Party, as one of the first independent socialist Members of Parliament. The heritage Brecon Mountain Railway, a narrow-gauge steam line, now carries visitors into the surrounding Brecon Beacons National Park. GIS and Boundary Data The administrative boundary of Merthyr Tydfil Council is available for free download in GeoJSON and KML formats, sourced from the OS Open Geography portal (Crown copyright 2024). Compatible with QGIS, ArcGIS, Mapbox, and Google Earth, the dataset supports industrial heritage mapping, labour history research, railway heritage study, and demographic analysis across the Merthyr Tydfil council area.

📍 Administrative boundary of Merthyr Tydfil county