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| Navn | Grunnlagt | | Chiba, Japan | |
| Chicago, IL, USA | |
| Chingwantao, Kina | |
| Chios, Hellas | |
| Christchurch, New Zealand | |
| Christobal, Panama | |
| Cienfuegos, Cuba | |
| Civitavecchia, Italia | |
| Clyde, UK | |
| Cochin, India | |
| Coguimbo, Chile | |
| Colchester, UK | |
| Colombia | |
| Colombo, Ceylon | |
| Colon, Panama | |
| Constantza, Romania | |
| Cork, Irland. | |
| Corner Brook | |
| Cornwall | |
| Corunna, Spania | |
| Coryton, UK | |
| Cotonou, Benin | |
| Cowes, UK | |
| Crotone, Italia | |
| Curacao, Netherlands Antilles | |
