Map
General Information
| Postal Area | Southend-on-Sea |
| Postcode | SS1 3RT |
| User Type | Large (more than 25 items of mail per day) |
| Region | East of England |
| Country | England |
| Local authority | Southend-on-Sea |
| Introduction Date | 1988-03-01 |
| Termination Date | 1991-12-01 |
| IMD 2025 | Decile 10 (most deprived = 1, least = 10) Rank 30,999 of 33,755 English Indices of Deprivation 2025 |
Geographic Information
| Latitude | 51.5422690 |
| Longitude | 0.7572960 |
| Easting | 591300 |
| Northing | 186200 |
| Quality | Postcode terminated prior to Gridlink® initiative, last known ONS postcode grid reference |