China is about 54,220 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while China is approximately 9,596,960 sq km, making China 5,421,911% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (1.4 billion more people live in China).
Tip: This to-scale comparison of District of Columbia vs. China uses the Mercator projection, which distorts the size of regions near the poles.