Mountain Ash
WardNorth east Rhondda Cynon Taf. About 7,531 people (mid-2024 estimate) in 13 square kilometres.
Radon Affected Area by ward
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 ward. 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 96.8 per 1,000 people.
That compares with 86.2 per 1,000 people across Rhondda Cynon Taf.
Across Wales as a whole, the recorded crime rate was 96.7 per 1,000 people.
In August 2026 alone, 80 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 (360), other crime (166) and anti-social behaviour (71).
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.
Figures for the whole of Rhondda Cynon Taf
These figures are published for the whole of Rhondda Cynon Taf, not for each ward, so they describe all of Rhondda Cynon Taf and not Mountain Ash alone. See Rhondda Cynon Taf
Mountain Ash in brief
Mountain Ash had 7,248 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, 91.8% of homes and businesses could get gigabit-capable broadband in January 2026.
In Mountain Ash, 4.1% of residents aged 16 to 64 were claiming out-of-work benefits in August 2026.