SO
25 districts, 18,604 postcodes
Southampton, Eastleigh, New Forest, Winchester, Test Valley, Fareham, and others
| District | Postcodes | Local authority |
|---|---|---|
| SO14 | 847 | Southampton |
| SO15 | 1,164 | Southampton |
| SO16 | 1,542 | Southampton |
| SO17 | 441 | Southampton |
| SO18 | 940 | Southampton |
| SO19 | 1,194 | Southampton |
| SO20 | 346 | Test Valley |
| SO21 | 743 | Winchester |
| SO22 | 745 | Winchester |
| SO23 | 810 | Winchester |
| SO24 | 449 | Winchester |
| SO25 | 1 | Winchester |
| SO30 | 826 | Eastleigh |
| SO31 | 1,186 | Fareham |
| SO32 | 676 | Winchester |
| SO40 | 1,079 | New Forest |
| SO41 | 1,083 | New Forest |
| SO42 | 164 | New Forest |
| SO43 | 137 | New Forest |
| SO45 | 973 | New Forest |
| SO50 | 1,320 | Eastleigh |
| SO51 | 878 | Test Valley |
| SO52 | 185 | Test Valley |
| SO53 | 860 | Eastleigh |
| SO97 | 15 | Eastleigh |