Mexico:
slightly less than three times the size of Texas

Micronesia, Federated States of:
four times the size of Washington,
DC

Midway Islands:
about nine times the size of The Mall in Washington,
DC

Moldova:
slightly larger than Maryland

Monaco:
about three times the size of The Mall in Washington, DC

Mongolia:
slightly smaller than Alaska

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