Vienna Austro-Bavarian: Wean, one of Austria’s nine federal states, is the country’s capital and most populated city. It is the primate city of Austria, home to just over two million people.With a population of around 2.9 million, its greater metropolitan region accounts for approximately one-third of the nation’s total population. Vienna is the most populated city on the Danube River, the political, economic, and cultural hub of the nation, and the fifth-largest city in the EU by population.