Östermalm is a borough in central Stockholm, named after the dominating district. Except Östermalm (proper) there are four districts in the borough: Djurgården, Hjorthagen , Ladugårdsgärdet (popularly known as Gärdet), and Norra Djurgården . Note that a portion of northern Östermalm is organized in Norrmalm borough. The population as of 2004 is 61,253 on an area of 18.00 km&sup2, which gives a density of 3,402.94/km².