Hong Kong is about 6 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Hong Kong is approximately 1,108 sq km, making Hong Kong 526% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (6.7 million more people live in Hong Kong).
Tip: This to-scale comparison of District of Columbia vs. Hong Kong uses the Mercator projection, which distorts the size of regions near the poles.