- Alaska, Alaska, United States, (Administrative Boundary)1
- Alsea Bay, Oregon, United States, (Hydrographic)1
- Ashland, Oregon, United States, (Populated Place)1
- Astoria, Oregon, United States, (Populated Place)1
- Baja California, Baja California, Mexico, (Administrative Boundary)2
- Baker, Oregon, United States, (Administrative Boundary)1
- Burial Lake, Alaska, United States, (Hydrographic)1
- California, California, United States, (Administrative Boundary)1
- Cape Arago, Coos County, Oregon, United States1
- Carbon, Wyoming, United States, (Administrative Boundary)2
- Cascade Range, Oregon, United States, (Hypsographic)1
- Champoeg, Oregon, United States, (Populated Place)1
- City of Corvallis, Oregon, United States, (Administrative Boundary)1
- Clackamas, Oregon, United States, (Administrative Boundary)1
- Coachella Valley, California, United States, (Populated Place)1
- Colón, Colón, Panama, (Populated Place)1
- Coos Bay Estuary, Oregon, United States, (Hydrographic)1
- Coos Bay, Oregon, United States, (Hydrographic)1
- Coos, Oregon, United States, (Administrative Boundary)1
- Corvallis, Oregon, United States, (Populated Place)5