word | | Area - comparative |
| size | Mauritania | slightly larger than three times the size of New Mexico |
| size | Mauritius | almost 11 times the size of Washington, DC |
| size | Mayotte | slightly more than twice the size of Washington, DC |
| size | Mexico | slightly less than three times the size of Texas |
| size | Micronesia, Federated States of | four times the size of Washington, DC (land area only) |
| size | Monaco | about three times the size of The Mall in Washington, DC |
| size | Montserrat | about 0.6 times the size of Washington, DC |
| size | Mozambique | slightly less than twice the size of California |
| size | Namibia | slightly more than half the size of Alaska |
| size | Nauru | about 0.1 times the size of Washington, DC |
| size | Navassa Island | about nine times the size of The Mall in Washington, DC |
| size | Netherlands | slightly less than twice the size of New Jersey |
| size | New Zealand | about the size of Colorado |
| size | Niger | slightly less than twice the size of Texas |
| size | Nigeria | slightly more than twice the size of California |
| size | Niue | 1.5 times the size of Washington, DC |
| size | Norfolk Island | about 0.2 times the size of Washington, DC |
| size | Northern Mariana Islands | 2.5 times the size of Washington, DC |