| Rank | Country | Maritime claims |
| Cook Islands | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 nm or to the edge of the continental margin |
| Coral Sea Islands | territorial sea: 3 nm exclusive fishing zone: 200 nm |
| Costa Rica | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 nm |
| Cote d'Ivoire | territorial sea: 12 nm exclusive economic zone: 200 nm continental shelf: 200 nm |
| Croatia | territorial sea: 12 nm continental shelf: 200 m depth or to the depth of exploitation |
| Cuba | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm |
| Curacao | territorial sea: 12 nm exclusive fishing zone: 12 nm |
| Cyprus | territorial sea: 12 nm contiguous zone: 24 nm continental shelf: 200 m depth or to the depth of exploitation |
| Czech Republic | none (landlocked) |
| Denmark | territorial sea: 12 nm contiguous zone: 24 nm exclusive economic zone: 200 nm continental shelf: 200 m depth or to the depth of exploitation |
| Dhekelia | void |