SM postcode area
The SM area holds 7 districts and 4,326 live postcodes; its largest place is Sutton.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| SM1 | 843 | — |
| SM2 | 591 | Sutton |
| SM3 | 379 | Cheam |
| SM4 | 581 | Morden |
| SM5 | 707 | Carshalton |
| SM6 | 756 | Wallington |
| SM7 | 469 | Banstead |
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.