- Sacaton, Pinal County, Arizona5 objects
- Sacramento County, California453 objects
- Sacramento, Sacramento County, California11 objects
- Salmon Creek area, Sonoma County, California1 objects
- Salt Creek 1, Belize1 objects
- Salt Point area, Central Sonoma coast, Sonoma County1 objects
- Salton Sea region, Imperial County, California2 objects
- Samoa1 objects
- San Benito County, California10 objects
- San Bernardino County, California4 objects
- San Bruno, San Mateo County, California45 objects
- San Clemente Island, Southern Channel Islands, Los Angeles County1 objects
- San Diego County, California20 objects
- San Diego, San Diego County, California15 objects
- San Felipe region, Mexicali municipality, Baja California3 objects
- San Francisco Bay Area, California2,843 objects
- San Francisco County, California209 objects
- San Francisco Waterfront, San Francisco, San Francisco County179 objects
- San Francisco, San Francisco County, California201 objects
- San Gabriel Mission, Los Angeles County, California9 objects