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- Sabaskong Bay 35D
- Sabaskong Bay Indian Reserve No. 32C
- Sabaskong Bay Indian Reserve No. 35C
- Sabaskong Bay Indian Reserve No. 35F
- Sabaskong Bay Indian Reserve No. 35H
- Sable
- Sabourins Crossing
- Sadowa
- Sahanatien
- Salem
- Salem Corners
- Salford
- Salisbury
- Salmon Point
- Salmonville
- Saltford
- Sand Banks
- Sand Bay Corner
- Sand Castle Beach
- Sandfield Mills
- Sandhurst
- Sandhurst Shores
- Sandison
- Sand Lake
- Sandringham
- Sandtown
- Sandusk
- Sandwich
- Sandy Beach
- Sandy Bend
- Sandy Cove
- Sandy Cove
- Sandy Cove Acres
- Sandy Point
- Sandy Point Beach
- Sans Souci
- Saratoga
- Sarginson
- Sarnia 45
- Sauble Beach
- Sauble Beach North
- Sauble Beach South
- Sauble Falls
- Saug-A-Gaw-Sing 1
- Saugeen 29
- Saugeen and Cape Croker Fishing Islands Indian Reserve No. 1
- Saugeen Hunting Grounds First Nations Reserve 60A
- Saugeen Shores
- Saurin
- Sawlog Bay
- Scarlet Park
- Schindelsteddle
- Schomberg Heights
- Science Hill
- Scone
- Scotch Bush
- Scotch Point
- Scotch Settlement
- Scotia
- Scott Settlement
- Scott Settlement
- Scotts Landing
- Scudder
- Sea Breeze
- Seacliffe
- Seaforth
- Sebastopol
- Sebright
- Sebringville
- Seckerton
- Seebacks Hill
- Seeley
- Seeleys Bay
- Seguin
- Seguin Falls
- Selby
- Selkirk
- Selton
- Selton
- Seven Mile Narrows
- Severn
- Severn Bridge
- Severn Falls
- Seville
- Seymour Beach
- Shakespeare
- Shallow Lake
- Shands
- Shand's Corner
- Shanes
- Shanick
- Shanly
- Shannon Hall
- Shannons Corners
- Shannonville
- Shanty Bay
- Sharps Corners
- Sharpton
- Shawanaga 17
- Shawanaga Indian Reserve No. 17B
- Shawanaga Landing
- Sheatown
- Shebeshekong
- Shedden
- Sheldon
- Sheldon's Corners
- Sheppardton
- Shep's Subdivision
- Sheridan Park
- Sherkston
- Sherkston Beaches
- Sherwood Springs
- Sherwood Village
- Shiloh
- Shipka
- Shisler Point
- Shoal Lake
- Shoal Lake 34B2
- Shoal Lake Indian Reserve 37A
- Shoal Lake Indian Reserve No. 31J
- Shoal Lake Indian Reserve No. 34B1
- Shoal Lake Indian Reserve No. 39
- Shoal Lake (Part) 39a
- Shoal Lake (Part) 40
- Shore Acres
- Shouldice
- Showers Corners
- Shrewsbury
- Signet
- Silcote
- Sillsville
- Silver Bay
- Silver Birch Beach
- Silver Corners
- Silver Corners
- Silverdale
- Silver Hill
- Silvermoon
- Silvers Corners
- Simcoe
- Simcoe Beach
- Simcoe Island
- Simcoe Lodge
- Simcoeside
- Simpson Corners
- Sims Locks
- Sinasac Corners
- Sinclairville
- Sine
- Singhampton
- Sioux Narrows
- Sioux Narrows - Nestor Falls
- Six Mile Lake
- Six Nations Corner
- Skerryvore
- Skipness
- Slabtown
- Slade
- Sleeman
- Sloan Circle
- Smithdale
- Smith-Ennismore-Lakefield
- Smithville
- Smokehouse Island
- Snowdons Corners
- Snow Valley
- Snug Harbour
- Snug Harbour
- Snug Haven
- Snyder
- Solmesville
- Sombra
- Sonya
- Soperton
- Sopher's Landing
- Southampton
- South Augusta
- South Bay
- South Beach
- South Branch
- South Bruce
- South Bruce Peninsula
- South Buxton
- South Cayuga
- Southcott Pines
- South Dummer
- South Dundas
- South Elmsley
- South Fredericksburgh
- South Frontenac
- Southgate
- Southgate
- South Glengarry
- South Gower
- South Huron
- South Lancaster
- South Magnetawan
- South Marysburgh
- South Middleton
- South Monaghan
- South Mountain
- South Napanee
- South Pelham
- South Portage
- South River
- South Stormont
- Southview Beach
- Southview Cove
- Southview Estates
- Southwest Middlesex
- Southwest Oxford
- South-West Oxford
- South Wilberforce
- Southwold
- Southwood
- South Woodslee
- Spaffordton
- Sparkle City
- Sparrow Lake
- Sparta
- Speedside
- Spencerville
- Spier
- Spring Arbour
- Springbank
- Spring Brook
- Spring Creek
- Springdale Park
- Springfield
- Springford
- Springhurst Beach
- Springmount
- Springvale
- Spring Valley
- Springville
- Springwater
- Sprucedale
- Spruce Green
- Spry
- Squire
- Staffa
- St. Agatha
- Stag Island
- Stampville
- St. Andrews
- Stanleydale
- Stanley House
- St. Anns
- Staples
- Star Corners
- Starrat
- Starr's Beach
- St. Augustine
- Stayner
- St. Clair
- St. Clair Beach
- St. Clements
- St. Columban
- St. Davids
- Steenburg
- Steenburg Lake
- Stella
- St. Elmo
- St. Elmo
- Stephen's Bay
- Stepping Stone Island
- Stevenson
- Stevensville
- Stewart
- Stewart Hall
- Stewart Heights
- Stewarts Glen
- St. Helens
- Stirling
- Stirling Falls
- Stirling-Rawdon
- Stirton
- St. Ives
- St. Jacobs
- St. Joachim
- St. Johns
- St. Joseph
- St. Lawrence
- St. Lawrence Court
- St. Lawrence Woods
- St. Leonards Island
- St. Marys
- Stockdale
- Stoco
- Stokes Bay
- St. Ola
- Stoneleigh
- Stone Mills
- Stones Corners
- Stoney Point
- Stonyridge
- Stonywood
- Storie
- Storkson's Corner
- Storms Corners
- Story
- St. Pauls
- St. Paul's Station
- Straders Hill
- Straffordville
- Strangfield
- St. Raphaels
- Strasburg
- Stratford
- Strathallan
- Strathavon
- Strathburn
- Strathcona Park
- Strathmore
- Strathnairn
- Strathroy
- Strathroy-Caradoc
- Stromness
- Strong
- Strongville
- Stroud
- St. Thomas
- Sturgeon Bay
- Sturgeon Beach
- Sturgeon Glen
- Sturgeon Point
- St. Williams
- Sugarbush
- Sugar Island Indian Reserve No. 37A
- Sugarloaf Hill
- Sullivan Mills
- Sulphide
- Summerhill
- Summerlea
- Summers Corners
- Summerstown
- Summerstown Station
- Sunbury
- Sundridge
- Sunnidale
- Sunnidale Corners
- Sunny Plains
- Sunnyside
- Sunny Slope
- Sunset Beach
- Sunset Beach
- Sunset Beach
- Sunshine
- Sutorville
- Swan Crossing
- Sweaburg
- Sweets Corners
- Sweets Corners
- Swift Rapids
- Swindon
- Swinton Park
- Swiss Meadows
- Switzerville
- Swords
- Sydenham
- Sykeston
- Sylvan