| Pos | Name | Country | stamps | Since |
|---|---|---|---|---|
| 899 | Calpena Hernandez Jose Maria | España | 1 | 02/02/2017 |
| 993 | Calero Maria | España | 1 | 11/08/2022 |
| 494 | Calderon Santos Juan Carlos | Guatemala | 5 | 05/02/2012 |
| 717 | Calcaterra Roman | Argentina | 1 | 03/09/2009 |
| 269 | Calafell Cladera Rafael | España | 55 | 28/10/2010 |
| 174 | Calafell Ricardo | España | 130 | 19/08/2009 |
| 54 | Calabria Dueñas Ramon | España | 1028 | 19/08/2008 |
| 779 | Caicedo Camilo | Colombia | 2 | 27/07/2016 |
| 698 | Cafe Juan | Argentina | 1 | 15/08/2008 |
| 141 | Cáceres María Elena | Guatemala | 82 | 21/01/2009 |
| 464 | Cabral Osuna Juan Manuel | España | 13 | 12/06/2012 |
| 645 | Caballero Alejandro | España | 7 | 19/04/2012 |
| 913 | Cabal Uriegas Elizabeth | México | 1 | 05/07/2016 |
| 475 | C Marta | Argentina | 10 | 18/02/2010 |
| 574 | Busto Raudel | Cuba | 2 | 30/04/2009 |
| 318 | Bustillo Martret Jesus | España | 16 | 14/02/2009 |
| 393 | Buonfiglio Hugo | Argentina | 42 | 30/04/2015 |
| 836 | Builes Olga | Colombia | 1 | 16/06/2010 |
| 19 | Briones Manuel | España | 22967 | 21/08/2016 |
| 500 | Briola Roberto | Argentina | 11 | 03/03/2012 |