- San Francisco Bay Area, California12 objects
- San Francisco County, California2 objects
- San Francisco Waterfront, San Francisco, San Francisco County1 objects
- San Francisco, San Francisco County, California2 objects
- San Nicolas Island, Southern Channel Islands, Ventura County1 objects
- Sandoval County, New Mexico1 objects
- Santa Barbara County, California7 objects
- Santa Catalina Island, Southern Channel Islands, Los Angeles County2 objects
- Santa Cruz Island, Channel Islands, Southern California3 objects
- Sausalito, Marin County, California3 objects
- Site N-5 (North Shore Pump Station), San Francisco Waterfront, San Francisco1 objects
- Site Ocr2-30, Carchi Province, Ecuador1 objects
- South America46 objects
- Southern California10 objects
- Southern Channel Islands, Los Angeles County, California2 objects
- Southern Peru1 objects
- Southwestern United States1 objects
- Surprise Valley, Lassen County, California1 objects