- Macedonia - Republika Makedonija
- Madagascar - République de Madagascar
- Maine - The Pine Tree State
- Malawi - Republic of Malawi
- Malaysia - Independent federation in southeast Asia
- Maldives - Dhivehi Raajjeyge Jumhooriyyaa - Republic of Maldives
- Mali - République de Mali
- Malta - Repubblika ta' Malta
- Manitoba - Province of Canada
- Marshall Islands - Republic of the Marshall Islands
- Maryland - The Free State - ratified Constitution 28 Apr 1788
- Massachusetts - The Bay State - ratified Constitution 6 Feb 1788
- Mauritania - Al Jumhuriyah al Islamiyah al Muritaniyah - Islamic Republic of Mauritania
- Mauritius - Republic of Mauritius
- Mexico - Estados Unidos Mexicanos
- Miami, Florida - Seat of Miami-Dade county, incorporated 1896
- Michigan - The Wolverine State
- Micronesia - Federated States of Micronesia
- Middle East - The countries of southwestern Asia and northeastern Africa
- Minnesota - The North Star State
- Mississippi - The Magnolia State
- Missouri - The Show Me State
- Moldova - Republica Moldova
- Monaco - Principauté de Monaco
- Mongolia - Mongol Uls - State of Mongolia
- Montana - Big Sky Country
- Montenegro - Crna Gora, republic in the Balkan Peninsula
- Morocco - Al Mamlakah al Maghribiyah - Kingdom of Morocco
- Mozambique - República de Moçambique
- Myanmar - Pyidaungzu Myanma Naingngandaw - Union of Myanmar
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