| Maakhir |
| Macau |
| Macedonia |
| Madagascar |
| Madura |
| Maguindanao |
| Mahdiya |
| Mahratta Confederation |
| Mahri |
| Maine |
| Makran |
| Malaya |
| Malaysia |
| Malawi |
| Maldives |
| Mali |
| Malta |
| Maltese Order |
| Man, Isle of |
| Manchukuo |
| Manitoba |
| Maranhão |
| Marianas, Northern |
| Marshall Islands |
| Martinique |
| Maryland |
| Massa and Carrara |
| Massachusetts |
| Mato Grosso |
| Mato Grosso do Sul |
| Mauritania |
| Mauritius |
| Mayotte |
| Mecklenburg (1947-1952) |
| Mecklenburg-Schwerin |
| Mecklenburg-Strelitz |
| Mecklenburg-Vorpommern |
| Memel |
| Mempawa |
| Mexico |
| Michigan |
| Micronesia |
| Minas Gerais |
| Minnesota |
| Misiones |
| Mississippi |
| Missouri |
| Modena |
| Mohèli |
| Moldavia |
| Moldova |
| Moluccas, South |
| Monaco |
| Mongolia |
| Montenegro (till 1916) |
| Montenegro (since 2006) |
| Montserrat |
| Morocco |
| Morvi |
| Mosquito |
| Mozambique |
| Muscat |
| Myanmar |
| Mysore |