| Area/District | Active Postcodes |
| SO1 | 2,501 |
| SO14 | 1,382 |
| SO15 | 1,859 |
| SO16 | 1,876 |
| SO17 | 604 |
| SO18 | 1,354 |
| SO19 | 1,418 |
| SO2 | 2,761 |
| SO20 | 457 |
| SO21 | 928 |
| SO22 | 882 |
| SO23 | 1,578 |
| SO24 | 622 |
| SO25 | 10 |
| SO3 | 2,273 |
| SO30 | 1,086 |
| SO31 | 1,643 |
| SO32 | 828 |
| SO4 | 3,223 |
| SO40 | 1,433 |
| SO41 | 1,533 |
| SO42 | 218 |
| SO43 | 178 |
| SO45 | 1,278 |
| SO5 | 2,802 |
| SO50 | 1,761 |
| SO51 | 1,347 |
| SO52 | 206 |
| SO53 | 1,157 |
| SO9 | 1,120 |
| SO97 | 19 |