Sri Lanka Business Directory: LKA is the ISO 3 alphabet country code of Sri Lanka. Currency of Sri Lanka is රු, which has a short code of LKR. Capital of Sri Lanka is Sri Jayewardenepura Kotte. Sri Lanka has the population of 20950041 and approximate area is 65610.00 square kilometers (or approx. 40770.054 square miles). Population density of Sri Lanka is approx. 319/Km2 (or approx. 198.2266/mile2)