- CA-ElD-16 (Hawver Cave), El Dorado County, California1 objects
- CA-Fre-67, Fresno County, California2 objects
- Caipipendi, Bolivian Chaco, Bolivia1 objects
- Calaveras Big Trees State Park, Calaveras County, California1 objects
- California4 objects
- Camden, Camden County, New Jersey1 objects
- Canyon de Chelly, Apache County, Arizona2 objects
- Carrizo Rock, San Luis Obispo County, California1 objects
- Casa Grande Ruins, Pinal County, Arizona1 objects
- Cave of the Owls, Monzon Valley, Huanuco2 objects
- Celilo, Wasco County, Oregon3 objects
- Cerro Sechin, Ancash Region, Northern Peru23 objects
- Cerro Viejo, Marcahuamachuco, Northern Peru3 objects
- Cerro de Fraile, Canete Valley, Peru1 objects
- Cerro de Fraile, Cañete Region, Central Peru1 objects
- Cerro de las Monjas, Marcahuamachuco, Northern Peru13 objects
- Cerro de los Corrales, Marcahuamachuco, Northern Peru1 objects
- Chancan, Moche valley, La Libertad Region1 objects
- Chavín de Huantar, Ancash Region, Peru2 objects
- Chicago, Cook County, Illinois2 objects