Production place
- Carneros Rocks, Kern County, California7 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
- Casa de Moneda, Zacatecas, Mexico2 objects
- Cayuga, Cayuga County, New York2 objects
- Central America1 objects
- Chiapas, Mexico1 objects
- Chiconcuac de Juárez, State of Mexico, Mexico1 objects
- Chicopee Falls, Hampden County, Massachusetts1 objects
- Chigmecatitlán, Puebla, Mexico1 objects
- China4 objects
- Cliff House, San Francisco, California1 objects
- Cobridge, Stoke-on-Trent, Staffordshire, England6 objects
- Cochiti Pueblo, Sandoval County, New Mexico1 objects
- Colma, San Mateo County, California1 objects
- Colorado2 objects
- Columbia River, Oregon and Washington1 objects
- Columbus, Franklin County, Ohio1 objects