Mountain Ash
TownTown in Rhondda Cynon Taf, Wales.
Mountain Ash is an ONS built-up area: the land built up as one town, whatever council it is in. Figures for Mountain Ash add up the census output areas (or, for claimants, the neighbourhoods) that sit mostly inside it, so they are close to, but not exactly, the town’s own.
Radon Affected Area by town
Worked out by Open Index · 2022
About 100% of people in Mountain Ash live in a 1 km square that the radon atlas marks as a radon Affected Area.
How Mountain Ash compares
Each dot is a town. The black line marks the middle one.
Is Mountain Ash safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Mountain Ash at a rate of 94.4 per 1,000 people.
That compares with 96.7 per 1,000 people across Wales.
In August 2026 alone, 130 cases of crime and anti-social behaviour were recorded in Mountain Ash.
In the 12 months to August 2026, the most common types were violence and sexual offences (630), other crime (262) and anti-social behaviour (141).
A year earlier, the recorded crime rate in Mountain Ash was 95.1 per 1,000 people.
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest.
Deprivation in Mountain Ash, neighbourhood by neighbourhood
- Deprivation is ranked by neighbourhood, so Mountain Ash has no single figure. Of its 9 neighbourhoods with a rank:
- Decile 1 (Wales’s most deprived 10%): 2 neighbourhoods
- Decile 2: 2 neighbourhoods
- Decile 3: 4 neighbourhoods
- Decile 7: 1 neighbourhood
Welsh Index of Multiple Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in Wales.
Neighbourhoods in Mountain Ash
| Name | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
|---|---|---|---|---|
| Rhondda Cynon Taf 006A | 1,530 | 32.9 per 1,000 | 7 | 96.3% |
| Rhondda Cynon Taf 006B | 1,459 | 118.8 per 1,000 | 3 | 90.4% |
| Rhondda Cynon Taf 006C | 1,461 | 56.1 per 1,000 | 3 | 89.4% |
| Rhondda Cynon Taf 006D | 1,278 | 174.6 per 1,000 | 1 | 93.7% |
| Rhondda Cynon Taf 006E | 1,521 | 112.6 per 1,000 | 3 | 90.0% |
| Rhondda Cynon Taf 008A | 1,453 | 144.6 per 1,000 | 1 | 98.3% |
| Rhondda Cynon Taf 008B | 1,456 | 73.9 per 1,000 | 2 | 99.0% |
| Rhondda Cynon Taf 008C | 1,531 | 63.3 per 1,000 | 3 | 99.6% |
| Rhondda Cynon Taf 008D | 1,311 | 87.2 per 1,000 | 2 | 97.8% |
Your MP
- Alex Davies-JonesLabourMP for Pontypridd
As of , from the UK Parliament Members API. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.
Council1
Postcode districts covering Mountain Ash1
Middle areas in Mountain Ash2
Towns near Mountain Ash6
Mountain Ash in brief
Mountain Ash is a town in Rhondda Cynon Taf, Wales.
About 13,405 people lived in Mountain Ash in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £120,000 in 2025 across 127 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 94.4 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in Mountain Ash was £120,000 in 2025.
Mountain Ash had 13,002 usual residents at the census.
About 100% of people in Mountain Ash live in a 1 km square that the radon atlas marks as a radon Affected Area.
In Mountain Ash, 94.7% of homes and businesses could get gigabit-capable broadband in January 2026.