Co
- Comalapa, Chimaltenango, Guatemala
- Comalapa, Guatemala
- Combe Capelle, Dordogne, France
- Commar Wik, Greenland
- Comodoro Rivadavia, Chubut, Argentina
- Comoe, Cote d'Ivoire
- Comox, British Columbia, Canada
- Comox, Vancouver Island, British Columbia, Canada
- Comox Area, British Columbia, Canada
- COMOX-STRATHCONA, British Columbia, Canada
- Comox-Strathcona G, British Columbia, Canada
- Comox-Strathcona I, British Columbia, Canada
- Comoé, Cote d'Ivoire
- Confluence Of Anvik And Yukon Rivers, Alaska, USA
- Congo
- Connecticut, USA
- Constantinopolis, Istanbul, Turkey
- Constantinopolis, Turkey
- Cook Inlet, Alaska, USA
- Cook Inlet, Kenai Peninsula Borough, Alaska, USA
- Cook Islands
- Cook's Ranch near Texas Creek, British Columbia, Canada
- Cooper River, Canada
- Copenhagen, Denmark
- Copper, Canada
- Copper Center, Alaska, USA
- Copper Eskimo, Canada
- Copper Eskimo, Coronation Gulf, Canada
- Copper River, Alaska, USA
- Copper River, Canada
- Copper River, Yakutat Borough, Alaska, USA
- Coppermine, Canada
- Coppermine, Nunavut, Canada
- Coppermine River, Canada
- Coppermine River, Nunavut, Canada
- Coppermine River Near Lambert Island, Canada
- Coqualeetza grounds, Chilliwack, British Columbia, Canada
- Coquitlam, British Columbia, Canada
- Coral Harbour, Nunavut, Canada
- Cordero Alto, Ica, Peru
- Cordoba, Argentina
- Cordova, Alaska, USA
- Cordova, New Mexico, USA
- Cordova Bay, Prince Of Wales Island, Alaska, USA
- Corinth, Greece
- Corkscrew Creek, British Columbia, Canada
- Cornwall, England
- Coronation Gulf, Canada
- Coronation Gulf, Northwest Territories, Canada
- Costa Heere, Sitka Qwan, Sitka Vicinity, Baranof Island, Sitka Borough, Alaska, USA
- Costa Rica
- Cotabambas, Apurimac, Peru
- Cotabato, Philippines
- Cote d'Ivoire
- Cotopaxi, Ecuador
- Courtenay, Vancouver Island, British Columbia, Canada
- Cowichan, British Columbia, Canada
- Cowichan Bay, British Columbia, Canada
- Cowichan Bay, British Columbia, Duncan, British Columbia, Canada
- Cowichan Valley, British Columbia, Canada
- Cowichan Valley A, British Columbia, Canada
- Cowichan Valley B, British Columbia, Canada
- Cowichan Valley G, British Columbia, Canada
- Cowlitz, Washington, USA
- Cowlitz County, Washington, USA
- Cowlitz River, Cowlitz County, Washington, USA
Cr
- Craig, Alaska, USA
- Cramer Passage, British Columbia, Canada
- Cranbrook, British Columbia, Canada
- Crescent Beach, British Columbia, Canada
- Crescent City, California, USA
- Creston, British Columbia, Canada
- Crete, Greece
- Criseby, Schleswig-Holstein, Germany
- Croatia
- Crofton, British Columbia, Canada
- Cross Sound, Alaska, USA
- Cross Sound, Skagway-Hoonah-Angoon Division, Alaska, USA
- Crow Agency, Montana, USA
Cu
- Cuantla, Morelos, Mexico
- Cuba
- Cuenca, Azuay, Ecuador
- Cultus Lake, British Columbia, Canada
- Cumberland Gulf, Canada
- Cumberland Sound, Aivilik, Canada
- Cumberland Sound, Baffin Island, Nunavut, Canada
- Cumberland Sound, Canada
- Cumberland Sound, Nunavut, Canada
- Cumpich, Campeche, Mexico
- Cumshewa, British Columbia, Canada
- Cumshewa, Moresby Island, Haida Gwaii, British Columbia, Canada
- Cusco, Peru
- Cusick, Washington, USA
- Cuttack, Odisha, India
- Cuttack, Orissa, India
- Cuyocuyo, Puno, Peru
- Cuzco, Peru
- Cuzco Province, Peru
Cy