Map
General Information
| Postal Area | Southend-on-Sea |
| Postcode | SS1 3LY |
| User Type | Large (more than 25 items of mail per day) |
| Region | East of England |
| Country | England |
| Local authority | Southend-on-Sea |
| Introduction Date | 1987-04-01 |
| Termination Date | 1992-12-01 |
| IMD 2025 | Decile 10 (most deprived = 1, least = 10) Rank 31,531 of 33,755 English Indices of Deprivation 2025 |
Geographic Information
| Latitude | 51.5340160 |
| Longitude | 0.7640080 |
| Easting | 591800 |
| Northing | 185300 |
| Quality | Postcode terminated prior to Gridlink® initiative, last known ONS postcode grid reference |