 Siler City - (North Carolina, United States) |
| Siliguri - (India) |
| Silkeborg - (Denmark) |
| Siloam Springs - (Arkansas, United States) |
| Sils Maria - (Switzerland) |
| Silvaplana - (Switzerland) |
| Silvassa - (India) |
| Silver Bay - (Minnesota, United States) |
| Silver Bay - (New York, United States) |
| Silver City - (New Mexico, United States) |
| Silver City - (Michigan, United States) |
| Silver Creek - (Colorado, United States) |
| Silver Spring - (Maryland, United States) |
| Silver Springs - (Florida, United States) |
| Silverdale - (Washington, United States) |
| Silverthorne - (Colorado, United States) |
| Silverton - (Colorado, United States) |
| Silvi Marina - (Italy) |
| Simcoe - (Ontario, Canada) |
| Simeri - (Italy) |
| Simi - (Greece) |
| Simi Valley - (California, United States) |
| Simla - (India) |
| Simmern - (Germany) |
| Simonstown - (South Africa) |
| Simpang - (Brunei) |
| Simpson Bay - (St. Martin/Maarten) |
| Simpsonbay - (Netherlands Antilles) |
| Simpsonville - (South Carolina, United States) |
| Simpsonville - (Kentucky, United States) |
| Simrishamn - (Sweden) |
| Simsbury - (Connecticut, United States) |
| Sinaia - (Romania) |
| Sindelfingen - (Germany) |
| Sinemoretz - (Bulgaria) |
| Sines - (Portugal) |
| Singapore - (Singapore) |
| Singaraja - (Indonesia) |
| Singer Island - (Florida, United States) |
| Singleton - (New South Wales, Australia) |
| Sinnington - (York, United Kingdom) |
| Sint Martens Latem - (Belgium) |
| Sint Nicolaasga - (Netherlands) |
| Sint Niklaas - (Belgium) |
| Sint Pieters Leeuw - (Belgium) |
| Sint Truiden - (Belgium) |
| Sinton - (Texas, United States) |
| Sintra - (Portugal) |
| Sinzig Bad Bodendorf - (Germany) |
| Siofok - (Hungary) |
| Sion - (Switzerland) |
| Sioux Center - (Iowa, United States) |
| Sioux City - (Iowa, United States) |
| Sioux Falls - (South Dakota, United States) |
| Sipplingen - (Germany) |
| Siracusa - (Sicily Is, Italy) |
| Siren - (Wisconsin, United States) |
| Sirkeci - (Istanbul, Turkey) |
| Sirmione - (Italy) |
| Sisimiut - (Greenland) |
| Sispony - (Andorra) |
| Sisseton - (South Dakota, United States) |
| Sissi - (Crete Is, Greece) |
| Sister Bay - (Wisconsin, United States) |
| Sisteron - (France) |
| Sisters - (Oregon, United States) |
| Sistersville - (West Virginia, United States) |
| Sitges - (Spain) |
| Sitiawan - (Perak, Malaysia) |
| Sitka - (Alaska, United States) |
| Sittingbourne Kent - (United Kingdom) |
| Sivota - (Greece) |
| Sjaellands Odde - (Denmark) |
| Sjusjoen - (Norway) |
| Skaelskor - (Denmark) |
| Skaerbaek - (Denmark) |
| Skagen - (Denmark) |
| Skagway - (Alaska, United States) |
| Skala - (Patmos Is, Greece) |
| Skanderborg - (Denmark) |
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