Merthyr Tydfil (Welsh: Merthyr Tudful) is a county borough in the south Wales valleys, at the head of the Taff valley. It covers 43 square miles (111 km2), had 58,839 residents at the 2021 census, and is run from the Civic Centre on Castle Street in Merthyr Tydfil town.
The town of Merthyr Tydfil is the largest settlement and the borough’s only sizeable centre. Treharris, Bedlinog, Aberfan and Troedyrhiw make up most of the rest, strung along the Taff and Bargoed Taf valleys.
| Country | Wales, United Kingdom |
|---|---|
| Status | County borough (since 1996) |
| Area | 43 sq mi (111 km2) |
| Population (2021) | 58,839 |
| Density | 530 people per km2 |
| Welsh speakers | 8.9% (2021 census) |
| Largest town | Merthyr Tydfil |
| Council | Merthyr Tydfil County Borough Council |
| Postcodes | CF46, CF47, CF48 |
Towns and Villages in Merthyr Tydfil
The county borough has 48 named settlements. Because Merthyr grew as a run of ironworks villages that later joined up, the list mixes free-standing villages such as Bedlinog and Pontsticill with the town’s own districts, such as Dowlais, Gurnos and Penydarren, which most residents still treat as separate places.
- Abercanaid
- Aberfan
- Abermorlais
- Bedlinog
- Cae-draw
- Cae-pant-tywyll
- Cefn-coed-y-cymmer
- Clwydyfagwyr
- Cwmfelin
- Dowlais
- Dowlais Top
- Edwardsville
- Galon Uchaf
- Gellideg
- Georgetown
- Glebeland
- Goitre Coed
- Gurnos
- Heolgerrig
- Incline Top
- Llwyn-onn
- Merthyr Tydfil
- Merthyr Vale
- Morgan Town
- Mountain Hare
- Pant
- Pen-y-Darren
- Pen-y-wern
- Pentrebach
- Pentwyn Berthlwyd
- Penyard
- Penyrheol
- Pontsticill
- Quakers Yard
- Quar, The
- Rhyd-y-car
- Taff Merthyr Garden Village
- Thomas Town
- Trefechan
- Treharris
- Trelewis
- Troedyrhiw
- Twynyrodyn
- Tydfil’s Well
- Williamstown
- Winchfawr
- Ynys-fach
- Ysgubor Newydd
Geography
Merthyr Tydfil sits at the northern end of the south Wales coalfield, where the Taff valley narrows below the sandstone escarpment of the Brecon Beacons. Powys lies to the north, Caerphilly to the east, and Rhondda Cynon Taf to the south and west. The Powys boundary is also the boundary of Bannau Brycheiniog National Park, which takes in the northern third of the borough.
Two rivers, the Taf Fawr and the Taf Fechan, meet just above the town to form the Taff, which then runs 25 miles south to Cardiff. Both upper valleys are dammed: Pontsticill, Pentwyn and Neuadd on the Taf Fechan, Llwyn-on, Cantref and Beacons on the Taf Fawr. The land rises to 2,024 ft (617 m) on Cefn yr Ystrad, on the northern boundary above Pontsticill.
Demographics
The 2021 census counted 58,839 usual residents, almost unchanged from 2011. That makes Merthyr Tydfil the second smallest principal area in Wales by population, after Blaenau Gwent, but one of the most densely settled outside the cities because nearly everyone lives on the valley floor.
8.9% of residents aged three and over reported that they could speak Welsh in 2021. Merthyr was one of only four Welsh local authorities where that share rose over the decade, against a national fall.
Economy and Local Life
Public services, retail and light manufacturing carry the borough. Cyfarthfa Retail Park and the town centre serve the upper valleys as far as Brecon, and the Prince Charles Hospital is one of the largest employers.
Ffos-y-fran, the last opencast coal site in Wales, stopped extraction in November 2023 and is being restored. Trago Mills, Hoover’s former Pentrebach plant and the industrial estates at Dowlais Top and Pant carry most of the private-sector jobs. BikePark Wales at Gethin Woods draws mountain bikers year-round.
History
The name means the burial place of Tydfil, a daughter of King Brychan of Brycheiniog said to have been killed for her faith around 480. “Merthyr” here follows the Latin martyrium, a church over a martyr’s grave, rather than the modern Welsh word for martyr.
Four ironworks, Dowlais, Cyfarthfa, Penydarren and Plymouth, made Merthyr the largest town in Wales by 1801 and one of the great iron centres of the world. Richard Trevithick ran the first steam locomotive to haul a load on rails from Penydarren to Abercynon in February 1804. The Merthyr Rising of 1831 ended with the execution of Dic Penderyn and the first recorded flying of the red flag as a workers’ banner.
On 21 October 1966 a colliery spoil tip slid onto Pantglas Junior School in Aberfan, killing 144 people, 116 of them children. The disaster reshaped tipping law across Britain.
Getting There
The A470 is the main road, running south to Cardiff in about 40 minutes and north over the Beacons to Brecon. The A465 Heads of the Valleys road crosses east to west, dualled throughout, linking Abergavenny to Neath. The A4054 follows the older valley route through Troedyrhiw and Pentrebach.
Merthyr Tydfil station is the northern terminus of the Merthyr Line, with trains to Pontypridd and Cardiff Central. Pentrebach, Troedyrhiw, Merthyr Vale, Quakers Yard and Trelewis lie on the same route. Cardiff Airport is about 35 miles south. The Brecon Mountain Railway runs a narrow-gauge line north from Pant into the national park.
Frequently Asked Questions
What is the population of Merthyr Tydfil?
58,839 at the 2021 census, for the county borough as a whole.
How many towns and villages are there in Merthyr Tydfil?
48 named settlements, including the districts of Merthyr town itself, such as Dowlais, Penydarren and Gurnos.
What is the largest town in Merthyr Tydfil?
Merthyr Tydfil. Treharris is the next largest, followed by Aberfan, Troedyrhiw and Bedlinog.
Which council covers Merthyr Tydfil?
Merthyr Tydfil County Borough Council, based at the Civic Centre on Castle Street.
What are the postcodes for Merthyr Tydfil?
CF47 and CF48 cover the town and its districts, and CF46 covers Treharris, Trelewis and Bedlinog.
Where is Merthyr Tydfil?
At the head of the Taff valley in south Wales, 23 miles north of Cardiff and immediately south of Bannau Brycheiniog National Park.