S
- Sabillasville
- Saint Anthony
- Saint Augustine
- Saint Catherine
- Saint Charles
- Saint Clement Shores
- Saint George Island
- Saint Inigoes
- Saint James
- Saint Jerome Shores
- Saint Leonard
- Saint Lukes
- Saint Margarets
- Saint Martin
- Saint Mary's City
- Saint Marys River Estates
- Saint Michaels
- Saint Stephen
- Salem
- Salisbury
- Sandgates
- Sand Spring
- Sandy Bottom
- Sandy Hill Acres
- Sandy Hook
- Sandyland Beach
- Sandy Springs
- Sang Run
- Sanmar
- Sassafras
- Saulsbury
- Savage
- Scaggsville
- Scarboro
- Scarboro
- Scarff
- Scientists Cliffs
- Scotland
- Scottown
- Seabrook
- Seat Pleasant
- Seawilde
- Secretary
- Selby-on-the-Bay
- Selbys Landing
- Selbysport
- Seneca
- Seneca Park
- Severn
- Severna Park
- Seward
- Seymour
- Shady Bower
- Shady Side
- Shallmar
- Shamrock Acres
- Shamrock Glen Estates
- Shane
- Sharon
- Sharpsburg
- Sharptown
- Shavox
- Shawan
- Shawsville
- Shelltown
- Shepperd
- Shervetes Corner
- Sherwood
- Sherwood Manor
- Shiloh
- Shiloh
- Shiloh Church
- Shipley
- Shoemakers Lot
- Shoreham Beach
- Shorewood
- Shorters Wharf
- Showell
- Shufelt
- Silesia
- Siloam
- Silver Hill
- Silver Run
- Silver Spring
- Simms Wharf
- Simpsonville
- Sinepuxent
- Singer
- Sir Johns Run
- Skidmore
- Skipton
- Slabtown
- Sleepy Creek
- Slidell
- Smallwood
- Smithbrook Acres
- Smith Island
- Smithsburg
- Smithville
- Smithville
- Snow Hill
- Society Hill
- Sollers
- Sollers
- Solomons
- Somerset
- Sotterley
- South Bel Air
- South Branch
- Southeast Landing
- South Gate
- South Kensington
- South Laurel
- Sparks
- Speilman
- Spence
- Spencerville
- Spickler
- Spook Hill
- Springdale
- Springfield
- Spring Gap
- Spring Grove
- Springhill
- Springhill Farms
- Spring House Estates
- Stablersville
- Stanley
- Starkley Corner
- Starr
- Steeplechase
- Stepney
- Stevensville
- Stevensville South
- Steyer
- Still Pond
- Stockton
- Stone Manor
- Stonemyer Manor
- Stoney Forest Estates
- Stony Run
- Strecker
- Street
- Stringtown
- Sudlersville
- Sugarland
- Suitland
- Sunderland
- Sunnybrook
- Sunnyside
- Sunnyside
- Sunrise Acres
- Sunrise Mobile Home
- Sunshine
- Susquehanna Point
- Swan Creek
- Swan Harbor
- Swan Haven
- Swann Hills
- Swanton
- Sweet Air
- Sykesville