5 Frankfurt, 732 thousand people

Frankfurt serves as the hub of the Rhein-Main metropolitan area. The city was named “Land of the Franks” because it was established on the Franks’ ancestral territory and the location of an old Main River ford.

Frankfurt serves as the hub of the Rhein-Main metropolitan area. The city was named “Land of the Franks” because it was established on the Franks’ ancestral territory and the location of an old Main River ford.