- Sidestrand
- Sideway
- Sidlesham
- Sidley
- Sidlow
- Sidmouth
- Sigglesthorne
- Silchester
- Sileby
- Silecroft
- Silk Willoughby
- Silkstone
- Silksworth
- Silloth
- Silsden
- Silver End
- Silverstone
- Silvington
- Simonburn
- Simonsbath
- Sinderby
- Sindlesham
- Sinnington
- Sissinghurst
- Sittingbourne
- Six Mile Bottom
- Sixhills
- Sizewell
- Skeffington
- Skeffling