SN postcode area
The SN area holds 20 districts and 14,709 live postcodes; its largest place is Swindon.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| SN1 | 797 | Swindon |
| SN2 | 956 | — |
| SN3 | 1,310 | — |
| SN4 | 916 | Royal Wootton Bassett |
| SN5 | 898 | Purton |
| SN6 | 681 | Highworth |
| SN7 | 564 | Faringdon |
| SN8 | 940 | Marlborough |
| SN9 | 323 | Pewsey |
| SN10 | 1,204 | Devizes |
| SN11 | 774 | Calne |
| SN12 | 823 | Melksham |
| SN13 | 666 | Neston |
| SN14 | 974 | Hinton |
| SN15 | 1,316 | Chippenham |
| SN16 | 530 | Malmesbury |
| SN25 | 821 | — |
| SN26 | 74 | Broad Blunsdon |
| SN38 | 124 | — |
| SN99 | 18 | — |
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.