word | | Area - comparative |
| size | Bolivia | slightly less than three times the size of Montana |
| size | Bouvet Island | about 0.3 times the size of Washington, DC |
| size | British Indian Ocean Territory | land area is about 0.3 times the size of Washington, DC |
| size | British Virgin Islands | about 0.9 times the size of Washington, DC |
| size | Cayman Islands | 1.5 times the size of Washington, DC |
| size | Chad | slightly more than three times the size of California |
| size | Chile | slightly smaller than twice the size of Montana |
| size | Christmas Island | about three-quarters the size of Washington, DC |
| size | Clipperton Island | about 12 times the size of The Mall in Washington, DC |
| size | Cocos (Keeling) Islands | about 24 times the size of The Mall in Washington, DC |
| size | Colombia | slightly less than twice the size of Texas |
| size | Comoros | slightly more than 12 times the size of Washington, DC |
| size | Congo, Democratic Republic of the | slightly less than one-fourth the size of the US |
| size | Cook Islands | 1.3 times the size of Washington, DC |
| size | Cyprus | about 0.6 times the size of Connecticut |
| size | Denmark | slightly less than twice the size of Massachusetts |
| size | Dhekelia | about three-quarters the size of Washington, DC |