| Manitoba |
|
| Mariana Islands |
|
| Mariana Islands, German Administration |
|
| Marienwerder |
|
| Marshall Islands |
|
| Marshall Islands, German Administration |
|
| Martinique |
|
| Maryland (MD) |
|
| Massachusetts (MA) |
|
| Mauritania |
|
| Mauritius |
|
| Mayotte |
|
| Mecklenburg-Schwerin |
|
| Memel Territory |
|
| Mesopotamia |
|
| Mewar |
|
| Mewar- Revenue Stamps |
|
| Mexico |
|
| Mexico- Revenue Stamps |
|
| Michigan (MI) |
|