Electoral ward
Seiriol
Seiriol
W05001501
This page groups current postcode coverage with source-backed Census, recorded sale and school counts. It is an official area summary, not a boundary or service-eligibility check.
Area summary
- Active postcodes
- 270
- Postcode districts
- 2
- Five-year recorded sales
- 432
- Open schools at matching postcodes
- 4
- Census 2021 residents
- 5,599
- Census 2021 households
- 2,617
- Mean postcode coordinate
- 53.27186, -4.11358
Quality-approved postcode districts
Related official areas
- Local authority districtIsle of AngleseyW06000001 · 270 postcodes
- Lower layer super output areaIsle of Anglesey 005AW01000005 · 96 postcodes
- Lower layer super output areaIsle of Anglesey 005BW01000013 · 80 postcodes
- Lower layer super output areaIsle of Anglesey 005DW01000026 · 57 postcodes
- Lower layer super output areaIsle of Anglesey 005EW01000035 · 37 postcodes
- Middle layer super output areaIsle of Anglesey 005W02000005 · 270 postcodes
- Westminster parliamentary constituencyYnys MônW07000112 · 270 postcodes
Source and limitations
Source: Office for National Statistics licensed under the Open Government Licence v.3.0.. Coverage: United Kingdom; Northern Ireland excluded pending rights review; Crown Dependencies outside product scope.
Names come from ONS Postcode Directory, release 2026-08, file Documents/WD Ward names and codes UK as at 05_26.csv, publisher date 1 Sept 2026.
OGL-3.0 with third-party rights. Counts reflect active postcodes in the current CheckNear.me publication and may differ from administrative service records.