| Country | Exchange rates |
| Seychelles |  Seychelles rupees (SCR) per US dollar - 12.26 (2011 est.) 12.068 (2010 est.) 13.61 (2009) 8 (2008) 6.5 (2007) |
| Sierra Leone |  leones (SLL) per US dollar - 4,400 (2011 est.) 3,978.09 |
| Singapore |  Singapore dollars (SGD) per US dollar - 1.234 (2011 est.) 1.3635 (2010 est.) 1.4545 (2009) 1.415 (2008) 1.507 (2007) |
| Sint Maarten |  Netherlands Antillean guilders (ANG) per US dollar - 1.79 (2010) 1.79 (2009) 1.79 (2008) 1.79 (2007) |
| Slovakia |  euros (EUR) per US dollar - 0.7107 (2011 est.) 0.755 (2010 est.) 0.7198 (2009 est.) 0.6827 (2008 est.) 0.7345 (2007 est.) |
| Slovenia |  euros (EUR) per US dollar - 0.7107 (2011 est.) 0.755 (2010 est.) 0.7198 (2009 est.) 0.6827 (2008 est.) 0.7345 (2007 est.) |
| Solomon Islands |  Solomon Islands dollars (SBD) per US dollar - 7.855 (2011 est.) 8.07 |
| Somalia |  Somali shillings (SOS) per US dollar - NA
|
| South Africa |  rand (ZAR) per US dollar - 7.164 (2011 est.) 7.32 (2010 est.) 8.42 (2009) 7.9576 (2008) 7.05 (2007) |
| South Georgia and the South Sandwich Islands | void |
| South Sudan | void |
| Southern Ocean | void |
| Spain |  euros (EUR) per US dollar - 0.7107 (2011 est.) 0.755 (2010 est.) 0.7198 (2009 est.) 0.6827 (2008 est.) 0.7345 (2007 est.) |
| Spratly Islands | void |
| Sri Lanka |  Sri Lankan rupees (LKR) per US dollar - 112 (2011 est.) 113.06 (2010 est.) 114.95 (2009) 108.33 (2008) 110.78 (2007) |