- North America10 objects
- The Americas10 objects
- United States10 objects
- California8 objects
- Northern California8 objects
- CA-Teh-193 (Payne Cave), Tehama County, California5 objects
- North Central California5 objects
- Tehama County, California5 objects
- CA-Sis-262 (Foster site), Bogus Creek, Siskiyou County2 objects
- Elko County, Nevada2 objects
- NV-El-11, Elko County, Nevada2 objects
- Nevada2 objects
- Northeastern California2 objects
- Siskiyou County, California2 objects
- CA-Hum-182, Humboldt County, California1 objects
- Humboldt County coast, Humboldt County, California1 objects
- Humboldt County, California1 objects
- Northwestern California1 objects
- Point Delgada, Humboldt County, California1 objects