- Chemnitz, Saxony, Germany (Hungary)1
- Chesapeake Bay, Maryland, Virginia, United States1
- Cheshire, New Haven County, Connecticut, United States1
- Cheshire, New Haven, Connecticut, United States1
- Chessy Copper mines, Chessy, Rhône-Alpes, France 1
- Chester County, Pennsylvania1
- Chester County, Pennsylvania, United States1
- Chester, Chester County, Pennsylvania, United States1
- Clarksville, Habersham County, Georgia, United States1
- Connecticut, United States1
- Copiapo, Atacama, Chile1
- Copper Mine Hill, Cumberland, Providence County, Rhode Island, United States1
- Cornwall, Lebanon (Dauphin) County, Pennsylvania, United States1
- Cornwall, Lebanon County, Pennsylvania, United States1
- Cuba1
- Cumberland County, Pennsylvania1
- Delaware County, New York, United States1
- Drammen, Buskerud County, Norway1
- Dundas, Zeehan District, Tasmania, Australia1
- Durham1