- Sabillasville
- Saint Charles
- Saint George Island
- Saint James
- Saint Leonard
- Saint Michaels
- Salisbury
- San Mar
- Sandy Hook
- Savage
- Scaggsville
- Seabrook
- Seat Pleasant
- Secretary
- Selby-on-the-Bay
- Severn
- Severna Park
- Shady Side
- Sharpsburg
- Sharptown
- Silver Hill
- Silver Spring
- Smith Island
- Smithsburg
- Snow Hill
- Solomons
- Somerset
- South Bel Air
- South Gate
- South Kensington
- South Laurel
- Spencerville
- Spring Gap
- Spring Ridge
- Springdale
- St. Charles
- Stevensville
- Stockton
- Sudlersville
- Suitland
- Suitland-Silver Hill
- Summerfield
- Swanton
- Sykesville
