Papua New Guinea Business Directory: PNG is the ISO 3 alphabet country code of Papua New Guinea. Currency of Papua New Guinea is K, which has a short code of PGK. Capital of Papua New Guinea is Port Moresby. Papua New Guinea has the population of 8418346 and approximate area is 462840.00 square kilometers (or approx. 287608.776 square miles). Population density of Papua New Guinea is approx. 18/Km2 (or approx. 11.1852/mile2)