| Portland Strangford | United Kingdom Time | -08:00 |
| Portland Strassen | Central European Time | -09:00 |
| Portland Strasburg | Eastern Time | -03:00 |
| Portland Street | United Kingdom Time | -08:00 |
| Portland Stratham | Eastern Time | -03:00 |
| Portland Stroudsburg | Eastern Time | -03:00 |
| Portland Střílky | Central European Time | -09:00 |
| Portland Strömstad | Central European Time | -09:00 |
| Portland Sturbridge | Eastern Time | -03:00 |
| Portland Sturgis | Mountain Time | -01:00 |
| Portland Štúrovo | Central European Time | -09:00 |
| Portland Subang | Western Indonesia Time | -15:00 |
| Portland Suan Dok | Indochina Time | -15:00 |
| Portland Stuttgart | Central Time | -02:00 |
| Portland Stutzheim-Offenheim | Central European Time | -09:00 |
| Portland Te Anau | New Zealand Time | -21:00 |
| Portland Te Awamutu | New Zealand Time | -21:00 |
| Portland Tealby | United Kingdom Time | -08:00 |
| Portland Team Valley Trading Estate | United Kingdom Time | -08:00 |
| Portland Subiaco | Western Australia Time | -16:00 |
| Portland Story City | Central Time | -02:00 |
| Portland Stowe | Eastern Time | -03:00 |
| Portland Stonington | Eastern Time | -03:00 |
| Portland Stony Plain | Mountain Time | -01:00 |
| Portland Stonyfell | Central Australia Time | -18:30 |
| Portland Stone Harbor | Eastern Time | -03:00 |
| Portland Stone Mountain | Eastern Time | -03:00 |
| Portland Stonegate | United Kingdom Time | -08:00 |
| Portland Stilton | United Kingdom Time | -08:00 |
| Portland Stirling | Mountain Time | -01:00 |
| Portland Simpang Ampat | Malaysia Time | -16:00 |
| Portland Simrishamn N | Central European Time | -09:00 |
| Portland Simpang Renggam | Malaysia Time | -16:00 |
| Portland Sinaia | Eastern European Time | -10:00 |
| Portland Stevensville | Eastern Time | -03:00 |
| Portland Stewiacke | Atlantic Time | -04:00 |
| Portland Silverton | Pacific Time | 00:00 |
| Portland Silveira | Western European Time | -08:00 |