Production place
- Cerro de los Corrales, Marcahuamachuco, Northern Peru3 objects
- Chalcis, Greece1 objects
- Changchun, Jilin province, China1 objects
- Chiapas, Mexico1 objects
- Chiconcuac de Juárez, State of Mexico, Mexico1 objects
- Chicopee Falls, Hampden County, Massachusetts1 objects
- Chigmecatitlán, Puebla, Mexico1 objects
- China145 objects
- Chios Island, Aegean Islands, Greece2 objects
- Chongqing municipality, Southwest China3 objects
- Civita Lavinia (ancient name), Lazio, Central Italy1 objects
- Cleitor, Arcadia, Peloponnese1 objects
- Cliff House, San Francisco, California1 objects
- Cobridge, Stoke-on-Trent, Staffordshire, England9 objects
- Cochiti Pueblo, Sandoval County, New Mexico1 objects
- Colma, San Mateo County, California1 objects
- Cologne, North Rhine-Westphalia, Germany3 objects
- Colombia1 objects
- Colorado2 objects
- Columbia River, Oregon and Washington1 objects