Washington, D.C. is 11% larger than Liechtenstein.
Area: 160 km2 World Factbook
Population: 37,313 (July 2014) World Factbook
Liechtenstein, officially the Principality of Liechtenstein, is a doubly landlocked alpine country and a microstate in Central Europe, bordered by Switzerland to the west and south and by Austria to the east and north. 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