Poland is about 1,767 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Poland is approximately 312,685 sq km, making Poland 176,558% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (37.5 million more people live in Poland).
Tip: This to-scale comparison of District of Columbia vs. Poland uses the Mercator projection, which distorts the size of regions near the poles.