Map
General Information
| Postal Area | Gwynedd |
| Postcode | LL77 7ZJ |
| User Type | Large (more than 25 items of mail per day) |
| Region | — |
| Country | Wales |
| Local authority | Isle of Anglesey |
| Introduction Date | 1997-06-01 |
| Termination Date | 1998-12-01 |
Geographic Information
| Latitude | 53.2578410 |
| Longitude | -4.3139400 |
| Easting | 245742 |
| Northing | 375925 |
| Quality | Postcode sector mean, (mainly PO Boxes) |