SO18 postcode district
SO18 holds 940 live postcodes around Southampton, in Southampton, Eastleigh.
No listed town or village has its centre in SO18; the nearest are on the neighbouring districts below.
Wards
| Name | Share of postcodes |
|---|---|
| Bitterne Park | 42% |
| Harefield | 36% |
| Swaythling | 7% |
| West End South | 7% |
| Bargate | 2% |
| West End North | 2% |
| Thornhill | 2% |
| Peartree | 1% |
| Eastleigh South | 1% |
Westminster constituencies
| Name | Share of postcodes |
|---|---|
| Southampton Itchen | 83% |
| Eastleigh | 10% |
| Romsey and Southampton North | 7% |
Deprivation
The middle postcode here sits in decile 5 of the English Index of Multiple Deprivation (2021-Census LSOAs), where decile 1 is the most deprived tenth of neighbourhoods and 10 the least. 17% of this district's postcodes sit in the most deprived three deciles, 15% in the least deprived three.
Deprivation deciles describe the LSOA neighbourhood each postcode sits in, weighted by postcodes rather than by people, because the postcode file carries no population. A district where the deprived neighbourhoods are densely populated will read better here than it would per resident.
Neighbouring districts in the SO area
SO14 · SO15 · SO16 · SO17 · SO19 · SO20 · SO21 · SO22 · SO23 · SO24 · SO25 · SO30 · SO31 · SO32 · SO40 · SO41 · SO42 · SO43 · SO45 · SO50 · SO51 · SO52 · SO53 · SO97
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.