SO postcode area
The SO area holds 25 districts and 18,623 live postcodes; its largest place is Southampton.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| SO14 | 852 | Southampton |
| SO15 | 1,167 | — |
| SO16 | 1,542 | Chilworth |
| SO17 | 441 | Portswood |
| SO18 | 940 | — |
| SO19 | 1,194 | Woolston |
| SO20 | 346 | Over Wallop |
| SO21 | 743 | Colden Common |
| SO22 | 747 | — |
| SO23 | 812 | Winchester |
| SO24 | 450 | New Alresford |
| SO25 | 1 | — |
| SO30 | 825 | Hedge End |
| SO31 | 1,188 | Bursledon |
| SO32 | 678 | Bishops Waltham |
| SO40 | 1,081 | Totton |
| SO41 | 1,080 | Lymington |
| SO42 | 164 | Brockenhurst |
| SO43 | 137 | Lyndhurst |
| SO45 | 973 | Hythe |
| SO50 | 1,320 | Eastleigh |
| SO51 | 881 | Romsey |
| SO52 | 186 | North Baddesley |
| SO53 | 860 | — |
| SO97 | 15 | — |
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.