Co
- Coban, Alta Verapaz, Guatemala
- Cochabamba, Bolivia
- Cochas, Ancash, Peru
- Cochiti Pueblo, New Mexico, USA
- Cod Island, British Columbia, Canada
- Coimbra, Portugal
- Cojata, Puno, Peru
- Cold Fish Lake, British Columbia, Canada
- Cold Fish Lake Area, British Columbia, Canada
- Cold Springs, Nevada, USA
- Coldwater, British Columbia, Canada
- Coli du Prairie, Minnesota, USA
- Colima, Mexico
- Colmonell, Scotland
- Cologne, Westphalia, Germany
- Colombia
- Colon, Panama
- Colorado, USA
- Colotenango, Huehuetenango, Guatemala
- Columbia, Connecticut, USA
- Columbia Lake, British Columbia, Canada
- Columbia Lake, Hot Springs, Fairmount, British Columbia, Canada
- Columbia River, British Columbia, Canada
- Columbia River, Oregon, USA
- Columbia River, Washington, USA
- Columbia River Region, Canada
- Columbia River Region, Oregon, USA
- Columbia River Region, Underwood Community, possibly, USA
- Columbia-Shuswap B, British Columbia, Canada
- Columbia-Shuswap F, British Columbia, Canada
- 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
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