Samoa Business Directory: WSM is the ISO 3 alphabet country code of Samoa. Currency of Samoa is WS$, which has a short code of WST. Capital of Samoa is Apia. Samoa has the population of 197695 and approximate area is 2831.00 square kilometers (or approx. 1759.1834 square miles). Population density of Samoa is approx. 69/Km2 (or approx. 42.8766/mile2)