Hong Kong is 6.2 times larger than Washington, D.C..
Area: 1,104 km2 World Factbook
Population: 7,112,688 (July 2014) World Factbook
Hong Kong, alternatively known by its initials H.K., is a former British Colony and is currently a Special Administrative Region of the People's Republic of China, enclosed by the Pearl River Delta and South China Sea. Wikipedia
Area: 178 km2 calculated
Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. Wikipedia