| Name | Participants | Dates | Stamps | ||
| 100th Anniversary of the Carabinieri in San Marino | 1 | 2021 | 1 | (incomplete) | |
| 20th Anniversary of Dipl..n San Marino and Croatia | 2 | (with Croatia) | 2012 | 4 | |
| Europa 1962 | 16 | (with Belgium - Turkey) | 1962 - 1963 | 34 | (incomplete) |
| Europa 1963 | 18 | (with Belgium - Turkey) | 1963 | 35 | (incomplete) |
| Europa 1964 | 19 | (with Austria - Turkey) | 1964 | 36 | (incomplete) |
| Europa 1965 | 19 | (with Belgium - Turkey) | 1965 | 36 | (incomplete) |
| Europa 1966 | 18 | (with Andorra (Fr) - Turkey) | 1966 | 35 | (incomplete) |
| Europa 1967 | 19 | (with Andorra (Fr) - Turkey) | 1967 | 39 | (incomplete) |
| Europa 1968 | 17 | (with Andorra (Fr) - Turkey) | 1968 | 34 | (incomplete) |
| Europa 1969 | 25 | (with Andorra (Fr) - Yugoslavia) | 1969 | 50 | (incomplete) |
| Europa 1970 | 18 | (with Andorra (Fr) - Yugoslavia) | 1970 | 39 | (incomplete) |
| Europa 1971 | 15 | (with Belgium - Yugoslavia) | 1971 | 31 | (incomplete) |
| Europa 1972 | 22 | (with Andorra (Fr) - Yugoslavia) | 1972 | 46 | (incomplete) |
| Italian Language Day 2009 | 3 | (with Italy - Vatican City) | 2009 | 3 | |
| Joint issue Italy-San Marino | 2 | (with Italy) | 2006 | 2 | |
| Joint issue Japan-San Marino | 2 | (with Japan) | 2010 | 14 | |
| Joint issue San Marino-S..ry Order of Malta (SMOM) | 1 | 2006 | 1 | (incomplete) | |
| Malta-San Marino Joint Stamp issue | 2 | (with Malta) | 2016 | 4 | (incomplete) |
| Techno Science Park San ..t issue Italy-San Marino | 2 | (with Italy) | 2015 | 4 | (incomplete) |
| Tourism - joint issue Gibraltar-San Marino | 2 | (with Gibraltar) | 2010 | 8 | (incomplete) |