Hong Kong is about 21 times smaller than New Hampshire.

New Hampshire is approximately 23,227 sq km, while Hong Kong is approximately 1,108 sq km, making Hong Kong 4.77% the size of New Hampshire. Meanwhile, the population of New Hampshire is ~1.3 million people (6.0 million more people live in Hong Kong).
Tip: This to-scale comparison of New Hampshire vs. Hong Kong uses the Mercator projection, which distorts the size of regions near the poles.