- Columbia, South Carolina, United States7
- Columbus (Ga.)1
- Columbus, Franklin County, Ohio, United States1
- Columbus, Lowndes County, Mississippi, United States1
- Columbus, Muscogee County, Georgia, United States1
- Combahee River (S.C.)1
- Concord (Mass.)1
- Concord, Middlesex County, Massachusetts, United States1
- Congaree River (S.C.)2
- Congaree, Lexington County, South Carolina, United States1
- Congaree, Richland County, South Carolina, United States1
- Connecticut1
- Conway (S.C.)3
- Conway, Horry County, South Carolina, United States2
- Cool Spring, Camden, Kershaw County, South Carolina, United States2
- Coos Bay, Coos County, Oregon, United States1
- Coosawhatchie (S.C.)1
- Coosawhatchie, Jasper County, South Carolina, United States5
- Coral Gables, Miami-Dade County, Florida, United States1
- Corning, Steuben County, New York, United States1