- Cooper River, South Carolina, United States1
- Coos Bay, Coos County, Oregon, 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
- Cumberland County, Pennsylvania1
- Cumberland, Allegany County, Maryland, United States1
- Darlington District, Darlington, Darlington County, South Carolina, United States1
- Darlington, Darlington County, South Carolina, United States1
- Davidson, Mecklenburg County, North Carolina, United States1
- Dead Sea1
- Delaware County, New York, United States1
- Delaware River1
- Demerara-Mahaica, Guyana1
- Democratic Socialist Republic of Sri Lanka1
- Drammen, Buskerud County, Norway1
- Dresden, Saxony, Germany1
- Dresden, Yates County, New York, United States1
- Dudley, West Midlands, England, United Kingdom1