The population density per district varies from 470 (Islands) to 55,000 (Kwun Tong) per sq. km. Before the combination of Mong Kok and Yau Tsim districts, Mong Kok had got the highest density.
District Councils (http://www.districtcouncils.gov.hk)
Hong Kong population and area by district: 1999 (http://www.demographia.com/db-hkdbd99.htm), htm format, 2001 (http://www.demographia.com/db-hkdbd19912001.pdf), pdf format
The districts were established, each with a district board, in the early 1980s, when HongKong was under British rule as a crown colony.
The District Administration Scheme commenced in 1982 with the establishment of a district board and a district management committee in each of the districts in HongKong.
The merge of Yau Tsim District and Mong Kok District became Yau Tsim Mong District.
HongKong, locally known as 香港 pinyin xiang1 gang3 (Cantonese: Heung Gong), meaning Fragrant Harbour, is a special administrative region (SAR) of the People's Republic of China, consisting of several islands in the South China Sea and a peninsula connecting it to mainland China.
The name "HongKong" is derived from HongKong Island in the South China Sea, at the mouth of the Xi Jiang[?] or Pearl River.
HongKong is one of the most densely populated areas in the world, with an overall density of nearly 6,700 people per square kilometre.