C'Ch
- Chinchero, Urubamba, Peru
- Chinlac, British Columbia, Canada
- Chinle, Arizona, USA
- Chiripa, Bolivia
- Chitina, Alaska, USA
- Chitral, Northwest Frontier, Pakistan
- Chiver's Pit, Hampshire, England
- Choco, Colombia
- Choiseul, Solomon Islands
- Chongojape, Peru
- Chongqing, Sichuan, China
- Chongzhou, Sichuan, China
- Chordeleg, Azuay, Ecuador
- Chubut, Argentina
- Chuen Lung, Hong Kong, China
- Chugach Island, Kenai Peninsula Borough, Alaska, USA
- Chulucanas, Piura, Peru
- Chuquisaca, Bolivia
- Church House, British Columbia, Canada
- Churchill, Manitoba, Canada
- Chuuk, Federated States of Micronesia
- Chyeeke, Admiralty Island, Alaska, USA
CiCl
- Clallam County, Washington state, USA
- Clallam County, Washington, USA
- Clapsop Beach, Oregon, USA
- Clarence Sound, Alaska, USA
- Claresholm, Alberta, Canada
- Clayoquot, British Columbia, Canada
- Clayoqyath, Vancouver Island, British Columbia, Canada
- Clearwater, Florida, USA
- Clemclemaluts, British Columbia, Canada
- Clinton, British Columbia, Canada
- Clinton Airport Site, British Columbia, Canada
- Cloelia Bay, British Columbia, Canada
- Cloudcroft, New Mexico, USA
- Clyde River, Kanngiqtugaapik Nunavut, Canada
- Clyde River, Northwest Territories, Canada
- Clyde River, Nunavut, Canada
Co
- Coast, Kenya
- Coast, Oregon, USA
- Coast, Tanzania
- Coast Between Yukon And Kuskokwim Rivers, Alaska, USA
- Coast central part of British Columbia, Canada
- 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
- Collings Creek, British Columbia, Canada
- Colmonell, Scotland
- Cologne, Westphalia, Germany
- Colombia
- Colon, Panama
- Colony Farm Regional Park, British Columbia, Canada
- 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