| Country | Area - comparative |
| Malta | slightly less than twice the size of Washington, DC |
| Marshall Islands | about the size of Washington, DC |
| Mauritania | slightly larger than three times the size of New Mexico |
| Mauritius | almost 11 times the size of Washington, DC |
| Mayotte | slightly more than twice the size of Washington, DC |
| Mexico | slightly less than three times the size of Texas |
| Micronesia, Federated States of | four times the size of Washington, DC (land area only) |
| Moldova | slightly larger than Maryland |
| Monaco | about three times the size of The Mall in Washington, DC |
| Mongolia | slightly smaller than Alaska |
| Montenegro | slightly smaller than Connecticut |
| Montserrat | about 0.6 times the size of Washington, DC |
| Morocco | slightly larger than California |
| Mozambique | slightly less than twice the size of California |
| Namibia | slightly more than half the size of Alaska |
| Nauru | about 0.1 times the size of Washington, DC |
| Navassa Island | about nine times the size of The Mall in Washington, DC |
| Nepal | slightly larger than Arkansas |
| Netherlands | slightly less than twice the size of New Jersey |
| New Caledonia | slightly smaller than New Jersey |
| New Zealand | about the size of Colorado |
| Nicaragua | slightly smaller than New York state |
| Niger | slightly less than twice the size of Texas |
| Nigeria | slightly more than twice the size of California |
| Niue | 1.5 times the size of Washington, DC |