Nevada is around the same size as New Zealand.

New Zealand is approximately 268,838 sq km, while Nevada is approximately 284,448 sq km, making Nevada 6% larger than New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (2.4 million fewer people live in Nevada).
Tip: This to-scale comparison of New Zealand vs. Nevada uses the Mercator projection, which distorts the size of regions near the poles.