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

Poland is approximately 312,685 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.06% the size of Poland. Meanwhile, the population of Poland is ~38.1 million people (37.5 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Poland vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.