The Vatican City.
The Pitcairn Islands have a population of around 50 making it the least populated jurisdiction in the world, although it is not a sovereign nation. The Vatican is the world's smallest and least populated country at about 920 people.
China is the most populated nation in the world.
Russia,mongolia.
The least populated country in the Caribbean is Saint Kitts and Nevis. It is a two-island nation with a combined population of around 50,000 people.
Antarctica.
India is the most populated democratic nation with 1.1 billion inhabitants.
Monaco, Singapore and South Korea are the most densely populated countries in the world. Mongolia, Namibia and Australia are least densely populated
Africa's most populous nation is Nigeria and it is the tenth most populous nation in the world!. :)
Vatican City
Greenland
i would have to say Vatican city is the least populated with a population of 821 people.
India is the nation with a rapidly growing population that experts predict will surpass China as the most highly populated nation in the world by the year 2045.