Sudan Business Directory: SDN is the ISO 3 alphabet country code of Sudan. Currency of Sudan is SD, which has a short code of SDG. Capital of Sudan is Khartoum. Sudan has the population of 41511526 and approximate area is 1861484.00 square kilometers (or approx. 1156726.1576 square miles). Population density of Sudan is approx. 22/Km2 (or approx. 13.6708/mile2)