Treharris & Trelewis
Middle areaSouth east Merthyr Tydfil. 8,625 people (mid-2024 estimate) in 9.9 square kilometres.
Radon Affected Area by middle area
Worked out by Open Index · 2022
About 80% of people in Treharris & Trelewis live in a 1 km square that the radon atlas marks as a radon Affected Area.
Recorded crime in Treharris & Trelewis
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Treharris & Trelewis at a rate of 56.5 per 1,000 people.
That compares with 110.6 per 1,000 people across Merthyr Tydfil.
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
| Kind of crime | Recorded |
|---|---|
| Violence and sexual offences | 189 |
| Other crime | 105 |
| Anti-social behaviour | 82 |
| Criminal damage and arson | 49 |
| Vehicle crime | 38 |
| Burglary | 13 |
| Shoplifting | 8 |
| Drug offences | 2 |
| Robbery | 1 |
| Theft from the person | 0 |
Source: police.uk, 12 months to August 2026
How Treharris & Trelewis compares
Each dot is a middle area. The black line marks the middle one.
Is Treharris & Trelewis safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Treharris & Trelewis at a rate of 56.5 per 1,000 people.
That compares with 110.6 per 1,000 people across Merthyr Tydfil.
Across Wales as a whole, the recorded crime rate was 96.7 per 1,000 people.
In August 2026 alone, 56 cases of crime and anti-social behaviour were recorded in Treharris & Trelewis.
In the 12 months to August 2026, the most common types were violence and sexual offences (189), other crime (105) and anti-social behaviour (82).
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 Merthyr Tydfil
These figures are published for the whole of Merthyr Tydfil, not for each middle area, so they describe all of Merthyr Tydfil and not Treharris & Trelewis alone. See Merthyr Tydfil
Treharris & Trelewis in brief
The median price paid for a home in Treharris & Trelewis was £147,500 in 2025.
Treharris & Trelewis had 8,681 usual residents at the census.
About 80% of people in Treharris & Trelewis live in a 1 km square that the radon atlas marks as a radon Affected Area.
In Treharris & Trelewis, 50.9% of homes and businesses could get gigabit-capable broadband in January 2026.