| Unknown |
|
| Abkhazia |
|
| Abu Dhabi |
|
| Aden |
|
| Aden - Protectorates |
|
| Aden- Revenue Stamps |
|
| Aden. Kathiri State of Seiyun |
|
| Aegean Islands |
|
| Afars and Issas |
|
| Afghanistan |
|
| Aguera, LA |
|
| Aitutaki |
|
| Ajman |
|
| Ajman- Revenue Stamps |
|
| Alabama (AL) |
|
| Åland Islands |
|
| Alaouites |
|
| Alaska (AK) |
|
| Albania |
|
| Albania, German Occupation In WWII |
|