St Mellons West
Middle areaNorth east Cardiff. 6,653 people in 1.1 square kilometres.
Radon Affected Area by middle area
Worked out by Open Index · 2022
About 80% of people in St Mellons West live in a 1 km square that the radon atlas marks as a radon Affected Area.
Recorded crime in St Mellons West
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in St Mellons West at a rate of 121.3 per 1,000 people.
That compares with 112.2 per 1,000 people across Cardiff.
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
| Kind of crime | Recorded |
|---|---|
| Violence and sexual offences | 359 |
| Other crime | 169 |
| Anti-social behaviour | 118 |
| Criminal damage and arson | 73 |
| Drug offences | 37 |
| Vehicle crime | 23 |
| Burglary | 18 |
| Shoplifting | 4 |
| Robbery | 3 |
| Theft from the person | 3 |
Source: police.uk, 12 months to August 2026
How St Mellons West compares
Each dot is a middle area. The black line marks the middle one.
Is St Mellons West safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in St Mellons West at a rate of 121.3 per 1,000 people.
That compares with 112.2 per 1,000 people across Cardiff.
Across Wales as a whole, the recorded crime rate was 96.7 per 1,000 people.
In August 2026 alone, 88 cases of crime and anti-social behaviour were recorded in St Mellons West.
In the 12 months to August 2026, the most common types were violence and sexual offences (359), other crime (169) and anti-social behaviour (118).
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 Cardiff
These figures are published for the whole of Cardiff, not for each middle area, so they describe all of Cardiff and not St Mellons West alone. See Cardiff
St Mellons West in brief
The median price paid for a home in St Mellons West was £230,500 in 2025.
St Mellons West had 6,468 usual residents at the census.
About 80% of people in St Mellons West live in a 1 km square that the radon atlas marks as a radon Affected Area.
In St Mellons West, 99.8% of homes and businesses could get gigabit-capable broadband in January 2026.