Indonesia Business Directory: IDN is the ISO 3 alphabet country code of Indonesia. Currency of Indonesia is Rp, which has a short code of IDR. Capital of Indonesia is Jakarta. Indonesia has the population of 266794980 and approximate area is 1904569.00 square kilometers (or approx. 1183499.1766 square miles). Population density of Indonesia is approx. 140/Km2 (or approx. 86.996/mile2)