Cities and Communities in Southern Ontario
(check also Northern Ontario)
| Sadowa | Scarborough | Skerryvore | Squire |
| Sagamok | Schomberg | Slabtown | Staffa |
| Sahanatien | Schutt | Smith's Landing | Stampville |
| St. Agatha | Scone | Smithfield | Stanleyville |
| St. Albert | Scotch Line | Smiths Falls | Staples |
| St. Andrews | Scotch Settlement | Smithville | Starkville |
| St. Anns | Scotia | Snelgrove | Stayner |
| St. Bernardin | Scotland | Snow Road Station | Steenburg Lake |
| St. Catharines | Scott Settlement | Snowball | Stella |
| St. Charles | Scottsville | Snug Harbour (Parry Sound) | Stevensville |
| St. Clair Beach | Scudder | Snug Harbour (Victoria) | Stewart Hall |
| St. Clements | Scugog | Snyder | Stewarttown |
| St. Columban | Seacliffe | Solina | Stirling |
| St. Davids | Seaforth | Solmesville | Stirton |
| St. Eugene | Seagrave | Sombra | Stittsville |
| St. George | Sebastopol | Songis | Stockdale |
| St. Helens | Sebright | Sonya | Stoco |
| St. Isidore | Sebringville | Soperton | Stokes Bay |
| St. Jacobs | Secord | Sour Spring | Stonecliffe |
| St. Jachim | Seeleys Bay | South Bay | Stoney Creek |
| St. Joseph | Selby | South Baymouth | Stoney Point |
| St. Marys | Selkirk | South Beach | Stonyridge |
| St. Ola | Selwyn | South Buxton | Stouffville |
| St. Pascal | Serpent River | South Cayuga | Strabane |
| St. Pauls Station | Severn Bridge | South Gloucester | Straffordville |
| St. Raphaels | Severn Falls | South Lancaster | Stratford |
| St. Thomas | Shakespeare | South Middleton | Strathburn |
| St. Williams | Shallow Lake | South Monaghan | Strathcona |
| Ste-Anne-de-Prescott | Shamrock | South Mountain | Strathroy |
| Ste-Rose-de-Prescott | Shanly | South River | Streetsville |
| Saintfield | Shannonville | South Woodslee | Stroud |
| Salem (Northumberland) | Shanty Bay | Southampton | Sturgeon Bay |
| Salem (Wellington) | Sharbot Lake | Southwold | Sturgeon Falls |
| Salford | Sharon | Southwood | Sturgeon Point |
| Saltford | Shawanaga | Sowerby | Sucker Creek |
| Sand Lake | Shedden | Spaffordton | Sudbury |
| Sandfield | Sheffield | Spanish | Summers Corners |
| Sandford | Sheguiandah | Sparta | Summerstown |
| Sandhill | Shelburne | Spencerville | Summerstown Station |
| Sandhurst | Sherkston | Speyside | Sunbury |
| Sandwich South-St. Clair Beach | Sheshegwaning | Spring Bay | Sunderland |
| Sandy Cove | Shetland | Spring Brook | Sundridge |
| Sandy Point | Shipka | Spring Creek | Sunnidale Corners |
| Sans Souci | Shrewsbury | Spring Valley | Sutton West |
| Sarnia | Siloam | Springfield | Sweaburg |
| Sarsfield | Silver Hill | Springford | Swift Rapids |
| Sauble Beach | Silver Lake | Springmount | Swinton Park |
| Sauble Beach North | Silver Water | Springtown | Swords |
| Sauble Beach South | Simcoe | Springvale | Sydenham |
| Sauble Falls | Simcoeside | Springville | Sylvan |
| Sawlog Bay | Singhampton | Sprucedale |