- Silver Springs
- Silverdale
- Silverwood
- Simeon
- Simmerman
- Simmons Gap
- Simmonsville
- Simon Island
- Simons Corner
- Simonsdale
- Simonson
- Simpkins
- Simpkins Corner
- Simpkinstown
- Simplicity
- Simpson Island
- Simpson Island
- Simpsons
- Sinai
- Sinclair Farms
- Sinclair Manor
- Singerly
- Singers Glen
- Sinking Creek
- Sinnickson
- Sir John Addition
- Sirons Mill
- Sissons Corner
- Six Mile
- Skeetertown