Hamburg, officially the Free and Hanseatic City of Hamburg, is the second-largest city in Germany after Berlin and 8th-largest in the Eur…Hamburg, officially the Free and Hanseatic City of Hamburg, is the second-largest city in Germany after Berlin and 8th-largest in the European Union with a population of over 1.9 million. The Hamburg Metropolitan Region has a population of over 5.1 million and is the ninth-biggest metropolitan region by GDP in the European Union.