Bremen, officially the City Municipality of Bremen, is the capital of the German state of the Free Hanseatic City of Bremen, a two-city-state …Bremen, officially the City Municipality of Bremen, is the capital of the German state of the Free Hanseatic City of Bremen, a two-city-state consisting of the cities of Bremen and Bremerhaven. With about 577,000 inhabitants, the Hanseatic city is the 11th-largest city of Germany and the second-largest city in Northern Germany after Hamburg.