| Country | Area - comparative |
| Cayman Islands | 1.5 times the size of Washington, DC |
| Central African Republic | slightly smaller than Texas |
| Chad | slightly more than three times the size of California |
| Chile | slightly smaller than twice the size of Montana |
| China | slightly smaller than the US |
| Christmas Island | about three-quarters the size of Washington, DC |
| Clipperton Island | about 12 times the size of The Mall in Washington, DC |
| Cocos (Keeling) Islands | about 24 times the size of The Mall in Washington, DC |
| Colombia | slightly less than twice the size of Texas |
| Comoros | slightly more than 12 times the size of Washington, DC |
| Congo, Democratic Republic of the | slightly less than one-fourth the size of the US |
| Congo, Republic of the | slightly smaller than Montana |
| Cook Islands | 1.3 times the size of Washington, DC |
| Coral Sea Islands | NA |
| Costa Rica | slightly smaller than West Virginia |
| Cote d'Ivoire | slightly larger than New Mexico |
| Croatia | slightly smaller than West Virginia |
| Cuba | slightly smaller than Pennsylvania |
| Cyprus | about 0.6 times the size of Connecticut |
| Czech Republic | slightly smaller than South Carolina |
| Denmark | slightly less than twice the size of Massachusetts |
| Dhekelia | about three-quarters the size of Washington, DC |
| Djibouti | slightly smaller than Massachusetts |
| Dominica | slightly more than four times the size of Washington, DC |
| Dominican Republic | slightly more than twice the size of New Hampshire |
| Ecuador | slightly smaller than Nevada |
| Egypt | slightly more than three times the size of New Mexico |
| El Salvador | slightly smaller than Massachusetts |
| Equatorial Guinea | slightly smaller than Maryland |
| Eritrea | slightly larger than Pennsylvania |
| Estonia | slightly smaller than New Hampshire and Vermont combined |
| Ethiopia | slightly less than twice the size of Texas |
| European Union | less than one-half the size of the US |
| Falkland Islands (Islas Malvinas) | slightly smaller than Connecticut |
| Faroe Islands | eight times the size of Washington, DC |
| Fiji | slightly smaller than New Jersey |
| Finland | slightly smaller than Montana |
| France | slightly less than the size of Texas |
| French Polynesia | slightly less than one-third the size of Connecticut |