- North America21 objects
- The Americas21 objects
- United States21 objects
- California20 objects
- Modoc County, California17 objects
- Northeastern California17 objects
- Northern California17 objects
- Surprise Valley, Modoc County, California17 objects
- CA-Mod-197, Modoc County, California9 objects
- CA-Mod-217, Modoc County, California7 objects
- CA-Mnt-375, Salinas Valley, Monterey County3 objects
- Central California3 objects
- Central California coast3 objects
- Monterey County, California3 objects
- Salinas Valley, Monterey County, California3 objects
- CA-Mod-211, Modoc County, California1 objects
- NV-Wa-187, Washoe County, Nevada1 objects
- Nevada1 objects
- Washoe County, Nevada1 objects