Production place
- Carneros Rocks, Kern County, California7 objects
- Carrhae (ancient place)2 objects
- Carson City County, Nevada2 objects
- Carson City mint, Carson City, Carson City County3 objects
- Carson City, Carson City County, Nevada11 objects
- Carson Valley, Carson City County, Nevada1 objects
- Carteia (ancient city), Bay of Gibraltar, Spain5 objects
- Carthage, Tunisia5 objects
- Carthago Nova (ancient Cartagena), Hispania Citerior6 objects
- Casa de Moneda, Zacatecas, Mexico2 objects
- Cascantum (ancient city), Hispania Citerior1 objects
- Castulo (ancient place), Hispania Citerior3 objects
- Cave of the Owls, Monzon Valley, Huanuco2 objects
- Cayuga, Cayuga County, New York2 objects
- Cañete Valley, Cañete Region, Central Peru1 objects
- Ccota, Puno, Peru1 objects
- Central America1 objects
- Ceos, Cyclades Islands1 objects
- Cerro Sechin, Ancash Region, Northern Peru22 objects
- Cerro de las Monjas, Marcahuamachuco, Northern Peru33 objects