Seiriol
WardEast Isle of Anglesey. About 5,552 people (mid-2024 estimate) in 53 square kilometres.
Radon Affected Area by ward
Worked out by Open Index · 2022
About 57% of people in Seiriol live in a 1 km square that the radon atlas marks as a radon Affected Area.
How Seiriol compares
Each dot is a ward. The black line marks the middle one.
Is Seiriol safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in Seiriol at a rate of 45.4 per 1,000 people.
That compares with 73.9 per 1,000 people across Isle of Anglesey.
Across Wales as a whole, the recorded crime rate was 96.7 per 1,000 people.
In August 2026 alone, 19 cases of crime and anti-social behaviour were recorded in Seiriol.
In the 12 months to August 2026, the most common types were violence and sexual offences (114), anti-social behaviour (47) and other crime (31).
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 Isle of Anglesey
These figures are published for the whole of Isle of Anglesey, not for each ward, so they describe all of Isle of Anglesey and not Seiriol alone. See Isle of Anglesey
Seiriol in brief
Seiriol had 5,679 usual residents at the census.
About 57% of people in Seiriol live in a 1 km square that the radon atlas marks as a radon Affected Area.
In Seiriol, 50.2% of homes and businesses could get gigabit-capable broadband in January 2026.
In Seiriol, 3.1% of residents aged 16 to 64 were claiming out-of-work benefits in August 2026.