| Country | Exchange rates |
| Canada |  Canadian dollars (CAD) per US dollar - 0.9801 (2011 est.) 1.0302 (2010 est.) 1.1431 (2009) 1.0364 (2008) 1.0724 (2007) |
| Cape Verde |  Cape Verdean escudos (CVE) per US dollar - 79.65 (2011 est.) 83.26 (2010 est.) 79.38 (2009) 73.84 (2008) 81.235 (2007) |
| Cayman Islands |  Caymanian dollars (KYD) per US dollar - 0.83 (2011 est.) 0.83 (2010 est.) |
| Central African Republic |  Cooperation Financiere en Afrique Centrale francs (XAF) per US dollar - 473.7 (2011 est.) 495.28 (2010 est.) 472.19 (2009)
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| Chad |  Cooperation Financiere en Afrique Centrale francs (XAF) per US dollar - 473.7 (2011 est.) 495.28 (2010 est.) 472.19 (2009) 447.81 (2008) 480.1 (2007) |
| Chile |  Chilean pesos (CLP) per US dollar - 470.9 (2011 est.) 510.25 (2010 est.) 560.86 (2009) 509.02 (2008) 526.25 (2007) |
| China |  Renminbi yuan (RMB) per US dollar - 6.455 (2011 est.) 6.7703 (2010 est.) 6.8314 (2009) 6.9385 (2008) 7.61 (2007) |
| Christmas Island |  Australian dollars (AUD) per US dollar - 0.9694 (2011) 1.0902 (2010) 1.2822 (2009) 1.2059 (2008) 1.2137 (2007) |
| Clipperton Island | void |
| Cocos (Keeling) Islands |  Australian dollars (AUD) per US dollar - 0.9694 (2011) 1.0902 (2010) 1.2822 (2009) 1.2059 (2008) 1.2137 (2007) |
| Colombia |  Colombian pesos (COP) per US dollar - 1,812.8 (2011 est.) 1,899 (2010 est.) 2,157.6 (2009) 2,243.6 (2008) 2,013.8 (2007) |
| Comoros |  Comoran francs (KMF) per US dollar - 349.7 (2011 est.) 371.46 (2010 est.) |
| Congo, Democratic Republic of the |  Congolese francs (CDF) per US dollar - 1,000 (2011 est.) 912 (2010 est.) 472.19 (2009) 559 (2008) 516 (2007) |