Liechtenstein is around the same size as District of Columbia.

District of Columbia is approximately 177 sq km, while Liechtenstein is approximately 160 sq km, making Liechtenstein 90.4% the size of District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (562,012 fewer people live in Liechtenstein).
Tip: This to-scale comparison of District of Columbia vs. Liechtenstein uses the Mercator projection, which distorts the size of regions near the poles.