American Samoa Business Directory: ASM is the ISO 3 alphabet country code of American Samoa. Currency of American Samoa is $, which has a short code of USD. Capital of American Samoa is Pago Pago. American Samoa has the population of 55679 and approximate area is 199.00 square kilometers (or approx. 123.6586 square miles). Population density of American Samoa is approx. 279/Km2 (or approx. 173.3706/mile2)