| Code | Name | Region |
|---|---|---|
| GBSKE | Skegness | LIN |
| GBSKZ | Skeld | ZET |
| GBSKD | Skelmersdale | LAN |
| GBSKM | Skelmorlie | NAY |
| GBSKL | Skelton | ERY |
| GBSKT | Skelton | RCC |
| GBEEN | Shobdon | HEF |
| GBSYN | Shoeburyness | ESS |
| GBSRL | Shoreditch | HCK |
| GBSHO | Shoreham | KEN |
| GBESH | Shoreham-by-sea | WSX |
| GBSHT | Shotton | DUR |
| GBOHT | Shotts | NLK |
| GBOTS | Shotts | NLK |
| GBOLH | Shouldham | NFK |
| GBSBR | Shrewsbury | SHR |
| GBSHA | Shrivenham | OXF |
| GBSRP | Shropham | NFK |
| GBOSP | Shropshire | SHR |
| GBSBH | Sible Hedingham | BDF |
| GBZCX | Sibsey | LIN |
| GBSDC | Sidcup | BEX |
| GBSES | Sidlesham | WSX |
| GBSYI | Sidley | ESX |
| GBSDM | Sidmouth | |
| GBSLR | Silchester | HAM |
| GBTLD | Shetland | ZET |
| GBSHX | Shieldaig | HLD |
| GBSEI | Shieldhall | GLG |
| GBIFN | Shifnal | SHR |
| GBSDN | Shildon | DUR |
| GBSGF | Shillingford | OXF |
| GBSIE | Shillingstone | DOR |
| GBONS | Shilton | OXF |
| GBSYL | Shinness | HLD |
| GBSHH | Shipdham | NFK |
| GBSPM | Shipham | SOM |
| GBSLK | Shiplake | OXF |
| GBSHI | Shipley | BRD |
| GBSXY | Shipley | WSX |
| GBSSU | Shipston On Stour | WAR |
| GBHPN | Shipton | NYK |
| GBSIO | Shirebrook | DBY |
| GBSIY | Shirley | DBY |
| GBILE | Shirley | HAM |
| GBSSK | Shiskine | NAY |
| GBSHV | Shell Haven | ESS |
| GBSLZ | Shelton | NFK |
| GBSHL | Shenfield | ESS |
| GBSCE | Shenley Church End |