Which Country is Least Densely Populated: From the Different Authentic and verified Sources it is observed that the CountryMongoliais the lowest densely populated country of the world. Approximately its density is 4 People per square mile. Its political system is parliamentary republic. It is the 19th largest country. Official Flag Official Language : Mongolian Capital and the largest city : Ulan Batora Currency : Tugrug (MNT) Total Population : 3,179,997 Total GDP : $13.264 billion Mongolia is divided into 6 different natural Zones : High Mountain Taiga (Forest) Forest Steppe Steppe Desert Steppe Desert