Bulgaria Business Directory: BGR is the ISO 3 alphabet country code of Bulgaria. Currency of Bulgaria is лв, which has a short code of BGN. Capital of Bulgaria is Sofia. Bulgaria has the population of 7036848 and approximate area is 110879.00 square kilometers (or approx. 68900.2106 square miles). Population density of Bulgaria is approx. 63/Km2 (or approx. 39.1482/mile2)