- 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
- Chesterfield, Hampshire County, Massachusetts, United States1
- Claiborne, Monroe County, Alabama, United States1
- Clarksville, Habersham County, Georgia, United States1
- Columbia, Richland County, South Carolina, United States1
- Connecticut, United States1
- Cooper River, South Carolina, 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
- Derbyshire, England , United Kingdom1
- Drammen, Buskerud County, Norway1