| Code | Name | Region |
|---|---|---|
| GBSVK | Seven Kings | RDB |
| GBSEV | Sevenoaks | KEN |
| GBSBC | Severn Beach | SGC |
| GBSVI | Sevington | KEN |
| GBSKO | Shackleford | SRY |
| GBSHB | Shaftesbury | DOR |
| GBSCP | Scunthorpe | NLN |
| GBSRF | Seacroft | NYK |
| GBSFR | Seaford | ESX |
| GBSEF | Seaforth | SFT |
| GBSEA | Seaham | DUR |
| GBSHU | Seahouses | NBL |
| GBSXX | Seal | KEN |
| GBXSS | Seal Sands | DUR |
| GBSEE | Seamer | NYK |
| GBSSC | Seascale | CMA |
| GBEON | Seaton | DEV |
| GBDSC | Seaton Carew | HPL |
| GBSDV | Seaton Delaval | NBL |
| GBOOS | Seaton Ross | ERY |
| GBSVW | Seaview | IOW |
| GBSEH | Sedbergh | CMA |
| GBSGE | Sedgefield | DUR |
| GBSGN | Seer Green | BKM |
| GBSTG | Seething | NFK |
| GBEFO | Sefton | SFT |
| GBSYC | Sayers Common | WSX |
| GBSCG | Scalasaig, Colonsay | AGB |
| GBSWY | Scalloway | ZET |
| GBSCC | Scalpay, Outer Hebridies | ELS |
| GBSQZ | Scampton | LIN |
| GBSCF | Scapa | ORK |
| GBSFW | Scapa Flow | ORK |
| GBSCA | Scarborough | NYK |
| GBSF5 | Scarcliffe | DBY |
| GBSFK | Scarfskerry | HLD |
| GBSCN | Scarinish, Tiree | AGB |
| GBSBK | Scarisbrick | LAN |
| GBSCS | Scatsta | |
| GBSY4 | Scaynes Hill | WSX |
| GBSCO | Sconser, Isle Of Skye | HLD |
| GBZCV | Scotlandwell | FIF |
| GBRIE | Scourie | HLD |
| GBSCR | Scrabster | HLD |
| GBSYH | Scrayingham | NYK |
| GBSRO | Scropton | DBY |
| GBSNK | Sandness | ZET |
| GBSDO | Sandown | IOW |
| GBSNI | Sandringham | NFK |
| GBSDZ | Sandsend | NYK |