Vienna  is the capital city of Austria with some 1.55 million residents.
Vienna is divided into 23 districts that are not known by name but by the numbers 1 - 23, similar to Paris and Prague.
The other main cities in descending order are:
     Graz approximately 223,000
     
     Linz approximately  181,000
     
     Salzburg approximately  143,000
     
     Innsbruck approximately  113,000
     
     Wels approximately  58,000
     
     Dornbirn approximately  43,000