- Siletz River, Lincoln County, Oregon, United States1
- Soda Springs, Idaho, United States, (Populated Place)1
- South Africa, , South Africa, (Administrative Boundary)1
- South Fork Alsea River, Oregon, United States, (Hydrographic)1
- South Fork John Day River, Oregon, United States, (Hydrographic)1
- South Fork McKenzie River, Oregon, United States, (Hydrographic)1
- Southern Oregon, Oregon, United States, (Area)1
- Starkey Experimental Forest Headquarters, Oregon, United States, (Spot)1
- Summitville mine, Colorado, United States, (Spot)1
- Tanzania, , Tanzania, (Administrative Boundary)1
- Tillamook Bay, Oregon, United States, (Hydrographic)1
- Tillamook, Oregon, United States, (Administrative Boundary)1
- Tioga Pass, California, United States, (Hypsographic)1
- Türkiye, , Türkiye, (Administrative Boundary)1
- Uganda, , Uganda, (Administrative Boundary)1
- Umpqua National Forest, Oregon, United States, (Vegetation)1
- Valdez-Cordova, Alaska, United States, (Administrative Boundary)1
- Walla Walla River, Washington, United States, (Hydrographic)1
- Washington, United States1
- Washington, Washington, United States, (Administrative Boundary)1