How Big Is Amsterdam. Amsterdam is a metropolitan municipality in the Dutch province of Noord-Holland. The municipality has 757,861 inhabitants (December 31, 2008, source: CBS) and covers an area of approximately 219 km ² (of which one quarter of water). Throughout the metropolitan area (urban Amsterdam) live approximately 1,354,000 people. The citycenter counts (in 2003) 78,946 inhabitants and covers an area of 8.02 km ² (of which 0.22 km ² water).