- Casablanca (Morocco)5
- Cascade Range.2
- Caserta (Italy)1
- Cashiers (N.C.)1
- Cass1
- Cassino (Italy)2
- Castel Gandolfo (Italy)1
- Castille-La Mancha1
- Castillo de San Marcos (Saint Augustine, Fla.)1
- Castillo del Morro (Havana, Cuba)1
- Castle Pinckney (Charleston, S.C.)2
- Castle Pinckney (S.C.)1
- Castleton, Derbyshire, England, United Kingdom1
- Catalina Island (Calif.)7
- Catania (Italy)1
- Catawba (S.C.)2
- Catawba Street, Columbia, S.C.3
- Cateechee (S.C.)3
- Catskill Mountains (N.Y.)2
- Catskill, Greene County, New York, United States1