All postcodes in SS9 3
| Postcode | Place | Type |
|---|---|---|
| SS9 3SP | Leigh-on-Sea | street |
| SS9 3SQ | Leigh-on-Sea | street |
| SS9 3SR | Leigh-on-Sea | street |
| SS9 3SS | Leigh-on-Sea | street |
| SS9 3ST | Leigh-on-Sea | street |
| SS9 3SU | Leigh-on-Sea | street |
| SS9 3SW | Leigh-on-Sea | street |
| SS9 3SX | Leigh-on-Sea | street |
| SS9 3SY | Leigh-on-Sea | street |
| SS9 3TG | Leigh-on-Sea | large user |
| SS9 3TH | Leigh-on-Sea | street |
| SS9 3TJ | Leigh-on-Sea | street |
| SS9 3TL | Leigh-on-Sea | street |
| SS9 3TN | Leigh-on-Sea | street |
| SS9 3TP | Leigh-on-Sea | street |
| SS9 3TQ | Leigh-on-Sea | street |
| SS9 3TR | Leigh-on-Sea | street |
| SS9 3TS | Leigh-on-Sea | street |
| SS9 3TT | Leigh-on-Sea | street |
| SS9 3TU | Leigh-on-Sea | street |
| SS9 3TW | Leigh-on-Sea | street |
| SS9 3TX | Leigh-on-Sea | street |
| SS9 3TY | Leigh-on-Sea | street |
| SS9 3TZ | Leigh-on-Sea | street |
| SS9 3UB | Leigh-on-Sea | street |
| SS9 3UD | Leigh-on-Sea | street |
| SS9 3UE | Leigh-on-Sea | street |
| SS9 3UF | Leigh-on-Sea | street |
| SS9 3UH | Southend-on-Sea | large user |
| SS9 3WF | Southend-on-Sea | large user |
Places in sector SS9 3
- Leigh-on-Sea 205
- Southend-on-Sea 5