word | | Nationality |
| Channel | Guernsey | noun: Channel Islander(s) adjective: Channel Islander |
| Channel | Jersey | noun: Channel Islander(s) adjective: Channel Islander |
| Chilean | Chile | noun: Chilean(s) adjective: Chilean |
| Chinese | China | noun: Chinese (singular and plural) adjective: Chinese |
| Chinese | Hong Kong | noun: Chinese/Hong Konger adjective: Chinese/Hong Kong |
| Chinese | Macau | noun: Chinese adjective: Chinese |
| Christmas | Christmas Island | noun: Christmas Islander(s) adjective: Christmas Island |
| Chuukese | Micronesia, Federated States of | noun: Micronesian(s) adjective: Micronesian; Chuukese, Kosraen(s), Pohnpeian(s), Yapese |
| citizens | Guam | noun: Guamanian(s) (US citizens) adjective: Guamanian |
| citizens | Northern Mariana Islands | noun: NA (US citizens) adjective: NA |
| citizens | Puerto Rico | noun: Puerto Rican(s) (US citizens) adjective: Puerto Rican |
| citizens | Virgin Islands | noun: Virgin Islander(s) (US citizens) adjective: Virgin Islander |
| Cocos | Cocos (Keeling) Islands | noun: Cocos Islander(s) adjective: Cocos Islander |
| collective | Ireland | noun: Irishman(men), Irishwoman(women), Irish (collective plural) adjective: Irish |
| collective | United Kingdom | noun: Briton(s), British (collective plural) adjective: British |
| colloquial | Barbados | noun: Barbadian(s) or Bajan (colloquial) adjective: Barbadian or Bajan (colloquial) |