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

China is approximately 9,596,960 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.0% the size of China. Meanwhile, the population of China is ~1.4 billion people (1.4 billion fewer people live in District of Columbia).
Tip: This to-scale comparison of China vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.