| Ref |
country name |
capital |
currencies |
continent |
flag |
| SAR | SAARLAND on to the stamps | Saarbrücken | franc de la Sarre, puis Deutsche Mark, puis euro | Europe |  |
| SAK | SACHA (YAKUTIA) (RUSSIA) on to the stamps | Yakutsk | ruble = 100 kopecks | Asia |  |
| SKL | SACHALIN (RUSSIA) on to the stamps | Yuzhno-Sakhalinsk | ruble = 100 kopecks | Asia |  |
| SAH | SAHARA OCCIDENTALE on to the stamps | El Aiaún | peseta = 100 centimes | Africa |  |
| SKI | SAINT KITTS on to the stamps | Basseterre | East Caribbean doillar = 100 cents | America |  |
| SAV | SAINT VINCENT on to the stamps | Kingstown | East Caribbean dollar = 100 cents | America |  |
| SVG | SAINT VINCENT E GRENADINE on to the stamps | Kingstown | East Caribbean dollar = 100 cents | America |  |
| SGB | SAINT VINCENT E GRENADINE - BEQUIA on to the stamps | Port Elizabeth | East Caribbean dollar = 100 cents | America |  |
| SGC | SAINT VINCENT E GRENADINE - CANOUAN on to the stamps | Charlestown | East Caribbean dollar = 100 cents | America |  |
| SGM | SAINT VINCENT E GRENADINE - MAYREAU on to the stamps | Old Wall | East Caribbean dollar = 100 cents | America |  |
| SGQ | SAINT VINCENT E GRENADINE - MUSTIQUE on to the stamps | | East Caribbean dollar = 100 cents | America |  |
| SGU | SAINT VINCENT E GRENADINE - UNION ISLAND on to the stamps | Clifton | East Caribbean dollar = 100 cents | America |  |
| SGY | SAINT VINCENT E GRENADINE - YOUNG ISLAND on to the stamps | Kingstown | East Caribbean dollar = 100 cents | America | |
| SPI | SAINT-PIERRE E MIQUELON on to the stamps | Saint-Pierre | French franc = 100 centimes, euro = 100 cents (from 2002) | America |  |
| SAM | SAMOA on to the stamps | Apia | tala = 100 sene | Oceania |  |
| SMA | SAN MARINO on to the stamps | San Marino | lira = 100 centesimi, euro = 100 cents (from 2002) | Europe |  |
| SLU | SANTA LUCIA on to the stamps | Castries | East Caribbean dollar = 100 cents | America |  |
| SHE | SANT`ELENA on to the stamps | Jamestown | Saint Helena pound = 100 pence | Africa |  |
| STH | SÃO TOMÉ E PRÍNCIPE on to the stamps | Saõ Tomé | dobra = 100 centimos | Africa |  |
| SEN | SENEGAL on to the stamps | Dakar | CFA franc = 100 centimes | Africa |  |
| SER | SERBIA on to the stamps | Belgrade | Serbian dinar = 100 paras | Europe |  |
| SEY | SEYCHELLES on to the stamps | Victoria | Seychellois rupee = 100 cents | Africa |  |
| SHA | SHARJAH on to the stamps | Sharjah | rupee = 100 naye paise, riyal = 100 dirhams (from 1966) | Asia |  |
| SIB | SIBERIA ORIENTALE (RUSSIA) on to the stamps | | ruble = 100 kopecks | Asia |  |
| SIE | SIERRA LEONE on to the stamps | Freetown | leone = 100 cents | Africa |  |
| SIN | SINGAPORE on to the stamps | Singapore | Singapore dollar = 100 cents | Asia |  |
| SYR | SIRIA on to the stamps | Damascus | Syrian pound = 100 piastres | Asia |  |
| SQU | SLOVACCHIA on to the stamps | Bratislava | Slovak koruna = 100 halierov | Europe |  |
| SLO | SLOVENIA on to the stamps | Ljubljana | tolar = 100 stotin, euro = 100 cents (from 2007) | Europe |  |
| SMO | SMOLENSK (RUSSIA) on to the stamps | Smolensk | ruble = 100 kopecks | Europe |  |
| SOI | SOMALIA on to the stamps | Mogadishu | Somali shilling = 100 centesimi | Africa |  |
| SOL | SOMALILAND on to the stamps | Hargeisa | Somaliland shilling = 100 centisimi | Africa |  |
| ESP | SPAGNA on to the stamps | Madrid | peseta = 100 centimos, euro = 100 cents (from 2002) | Europe |  |
| SRI | SRI LANKA (CEYLON) on to the stamps | Colombo | Sri Lankan rupee = 100 cents | Asia |  |
| USA | STATI UNITI (USA) on to the stamps | Washington, D.C. | US dollar = 100 cents | America |  |
| OMS | STATO DELL`OMAN on to the stamps | Nizwa | Omani rial = 1000 baizas | Asia |  |
| ADK | STATO KATHIRI DI HADHRAMAUT IN ADEN on to the stamps | | dinar = 1000 fils | Asia |  |
| ADY | STATO KATHIRI DI SEIYUN IN ADEN on to the stamps | | dinar = 1000 fils | Asia |  |
| ADM | STATO MAHRA DI ADEN on to the stamps | | dinar = 1000 fils | Asia |  |
| ADH | STATO QU`AITI DI HADHRAMAUT IN ADEN on to the stamps | | dinar = 1000 fils | Asia |  |
| RSA | SUDAFRICA (RSA) on to the stamps | Pretoria | rand = 100 cents | Africa |  |
| SUD | SUDAN on to the stamps | Khartoum | Sudanese pound = 100 piastres | Africa |  |
| OMA | SULTANATO DELL`OMAN on to the stamps | Muscat | Omani rial = 1000 baizas | Asia |  |
| SUR | SURINAME on to the stamps | Paramaribo | gulden = 100 cents, Surinamese dollar = 100 cents | America |  |
| SUE | SVEZIA on to the stamps | Stockholm | Swedish krona = 100 öre | Europe |  |
| SUI | SVIZZERA on to the stamps | Berne | Swiss franc = 100 centimes | Europe |  |