Andorra is about 2.6 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Andorra is approximately 468 sq km, making Andorra 164% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (516,163 fewer people live in Andorra).
Tip: This to-scale comparison of District of Columbia vs. Andorra uses the Mercator projection, which distorts the size of regions near the poles.