| Code | Name | Region |
|---|---|---|
| GBERE | Stamford Bridge | ERY |
| GBSAH | Standish | WGN |
| GBTND | Standlake | OXF |
| GBSON | Standon | STS |
| GBANF | Stanford | BDF |
| GBSFV | Stanford In The Vale | OXF |
| GBSLH | Stanford-le-hope | THR |
| GBSGU | Stanground | CAM |
| GBSOP | Stanhope | DUR |
| GBSNL | Stanley | DUR |
| GBTNY | Stanley | ERY |
| GBSOW | Stanlow | SHR |
| GBSTM | Stanmore | HRW |
| GBSNM | Stanmore | WBK |
| GBZDB | Stanningley | LDS |
| GBQNO | Stannington | NBL |
| GBSPA | Spalding | LIN |
| GBPWC | Spaldwick | CAM |
| GBZPB | Sparkbrook | BIR |
| GBSPR | Sparkford | SOM |
| GBZSB | Spean Bridge | HLD |
| GBSEP | Speen | WBK |
| GBSPK | Speke | LIV |
| GBSPE | Spellbrook | HRT |
| GBSPW | Spencers Wood | WOK |
| GBSPN | Spennymoor | DUR |
| GBPBY | Spilsby | LIN |
| GBSPO | Spondon | DBY |
| GBSUH | Spurn Head | |
| GBAIS | St Agnes | CON |
| GBSPQ | Stackpole Quay | PEM |
| GBSRD | Stafford | STS |
| GBSBU | Stainburn | NYK |
| GBSTS | Staines | SRY |
| GBSTZ | Staithes | NYK |
| GBSRI | Stalbridge | DOR |
| GBSEC | Southend | AGB |
| GBSND | Southend | ESS |
| GBSEN | Southend Municipal Apt | ESS |
| GBSAA | Southend-on-sea | ESS |
| GBSRQ | Southerness | DGY |
| GBSOF | Southfleet | KEN |
| GBST7 | Southgate | ENF |
| GBSSR | Southminster | ESS |
| GBSUW | Southowram | CLD |
| GBSRT | Southport | SFT |
| GBZDA | Southsea | POR |
| GBSWR | Southwark | SWK |
| GBSTA | Southwater | WSX |
| GBSUE | Southwell | NTT |