Burundi Business Directory: BDI is the ISO 3 alphabet country code of Burundi. Currency of Burundi is FBu, which has a short code of BIF. Capital of Burundi is Bujumbura. Burundi has the population of 11216450 and approximate area is 27830.00 square kilometers (or approx. 17293.562 square miles). Population density of Burundi is approx. 403/Km2 (or approx. 250.4242/mile2)