| Pos | Name | Country | stamps | Since |
|---|---|---|---|---|
| 18 | Argenta Mario | Uruguay | 2307 | 06/03/2009 |
| 100 | Arias Soledad | Colombia | 657 | 29/09/2011 |
| 276 | Arias Suarez Nilson Jairo | Colombia | 21 | 12/01/2009 |
| 591 | Arispe Henrry | Bolivia | 4 | 25/01/2009 |
| 798 | Ariza Miguel | Colombia | 2 | 15/04/2016 |
| 102 | Arnaiz H | España | 456 | 18/03/2009 |
| 114 | Arroyo Dario Javier | Argentina | 379 | 04/12/2008 |
| 30 | Arroyo Alejandro | España | 4027 | 09/01/2010 |
| 449 | Arroyo Carlos | España | 10 | 05/10/2012 |
| 943 | Art Glam | Argentina | 1 | 16/06/2012 |
| 923 | Asins Iniesta Francisco | España | 1 | 02/04/2020 |
| 812 | Avalos J. Alejandro | Colombia | 1 | 22/04/2013 |
| 11 | Avila Javier | España | 32330 | 11/04/2009 |
| 981 | Ayala Diego | España | 1 | 02/11/2011 |
| 421 | Azocar Joako | Chile | 12 | 10/09/2011 |
| 277 | Azofeifa Arguello Luis Rodolfo | Costa Rica | 151 | 10/09/2012 |
| 86 | B. B. | España | 550 | 19/08/2009 |
| 995 | Badale Andrei | España | 1 | 25/07/2010 |
| 684 | Baeza Pousa Antonio | España | 1 | 20/10/2011 |
| 127 | Baglantzis Alexandra | España | 545 | 01/10/2010 |