Spain is about 2,855 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Spain is approximately 505,370 sq km, making Spain 285,420% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (46.6 million more people live in Spain).
Tip: This to-scale comparison of District of Columbia vs. Spain uses the Mercator projection, which distorts the size of regions near the poles.