Nevada is about 257 times bigger than Hong Kong.

Hong Kong is approximately 1,108 sq km, while Nevada is approximately 284,448 sq km, making Nevada 25,572% larger than Hong Kong. Meanwhile, the population of Hong Kong is ~7.3 million people (4.6 million fewer people live in Nevada).
Tip: This to-scale comparison of Hong Kong vs. Nevada uses the Mercator projection, which distorts the size of regions near the poles.