| Pos | Name | Country | stamps | Since |
|---|---|---|---|---|
| 837 | Sard Jesus | España | 1 | 29/12/2011 |
| 34 | Sebastian Carlos | Argentina | 3138 | 22/09/2009 |
| 248 | Secades Pilar | España | 101 | 28/11/2011 |
| 829 | Sed Michel | Cuba | 1 | 02/06/2018 |
| 923 | Seifert Peter | Suecia | 1 | 16/11/2019 |
| 872 | Sena Catia | Brasil | 1 | 04/05/2014 |
| 91 | Senestrari Patiño Ernesto | España | 1076 | 15/11/2012 |
| 339 | Serra Antonio | España | 40 | 11/11/2009 |
| 212 | Serrano Jose | España | 130 | 24/09/2010 |
| 51 | Serrano Jose | España | 2951 | 08/09/2011 |
| 727 | Servat Luis | Perú | 1 | 17/03/2011 |
| 496 | Seufferheld Omar | Argentina | 11 | 20/02/2013 |
| 132 | Sierra Fran | España | 178 | 26/09/2008 |
| 15 | Sierra Licona Herberth | Honduras | 7242 | 17/06/2009 |
| 627 | Sierra Gomez Soraya | España | 8 | 02/03/2014 |
| 922 | Sifuentes Erick | México | 1 | 14/05/2012 |
| 980 | Siguenza Felipe | España | 1 | 13/10/2013 |
| 137 | Silva Juan Carlos | España | 420 | 12/12/2008 |
| 345 | Silva Gustavo | Argentina | 19 | 29/09/2010 |
| 964 | Silva Lorena | Chile | 1 | 08/09/2011 |