| Code | Country | Continent | Population | Life Expectancy |
| SMR | San Marino | Europe | 27,000 | 81.10 |
| SOM | Somalia | Africa | 10,097,000 | 46.20 |
| SPM | Saint Pierre and Miquelon | North America | 7,000 | 77.60 |
| SSD | South Sudan | Africa | 12,340,000 | 56.50 |
| STP | Sao Tome and Principe | Africa | 147,000 | 65.30 |
| SUR | Suriname | South America | 417,000 | 71.40 |
| SVK | Slovakia | Europe | 5,398,700 | 73.70 |
| SVN | Slovenia | Europe | 1,987,800 | 74.90 |
| SWE | Sweden | Europe | 8,861,400 | 79.60 |
| SWZ | Swaziland | Africa | 1,008,000 | 40.40 |
| SYC | Seychelles | Africa | 77,000 | 70.40 |
| SYR | Syria | Asia | 16,125,000 | 68.50 |
| TCA | Turks and Caicos Islands | North America | 17,000 | 73.30 |
| TCD | Chad | Africa | 7,651,000 | 50.50 |
| TGO | Togo | Africa | 4,629,000 | 54.70 |
| THA | Thailand | Asia | 61,399,000 | 68.60 |
| TJK | Tajikistan | Asia | 6,188,000 | 64.10 |
| TKM | Turkmenistan | Asia | 4,459,000 | 60.90 |
| TMP | East Timor | Asia | 885,000 | 46.00 |
| TON | Tonga | Oceania | 99,000 | 67.90 |