| Pos | Name | Country | stamps | Since |
|---|---|---|---|---|
| 100 | Arias Soledad | Colombia | 657 | 29/09/2011 |
| 18 | Argenta Mario | Uruguay | 2307 | 06/03/2009 |
| 891 | Arévalo Catalan Christian | Chile | 1 | 17/07/2017 |
| 355 | Arencibia Francisco | España | 37 | 24/06/2009 |
| 915 | Arellano Troncoso Vicente | Chile | 1 | 30/08/2016 |
| 997 | Ardolino Damian | Argentina | 1 | 23/05/2014 |
| 701 | Arbelo Norma | Puerto Rico | 2 | 26/05/2012 |
| 93 | Araya Fernandez Paula Alejandra | Chile | 519 | 18/06/2009 |
| 618 | Araujo Viviana | Argentina | 2 | 14/05/2012 |
| 448 | Aranibar Su-ming | Chile | 24 | 23/03/2017 |
| 118 | Aranaz Aintzane | España | 403 | 22/01/2010 |
| 793 | Apellido David | España | 1 | 02/03/2010 |
| 159 | Ap White | España | 122 | 07/02/2010 |
| 402 | Antoranz Enrique | España | 11 | 01/03/2010 |
| 748 | Antoneac Florin | España | 2 | 18/04/2013 |
| 787 | Anton Pedro A. | España | 1 | 28/10/2010 |
| 165 | Antoine Pascal | Bélgica | 81 | 14/11/2008 |
| 771 | Anselmo Miriam | Argentina | 2 | 10/02/2011 |
| 901 | Angulo Calero María Clemencia | Colombia | 1 | 11/12/2013 |
| 660 | Angel Miguel | España | 3 | 16/12/2011 |