Nevada is around the same size as New Mexico.

New Mexico is approximately 314,310 sq km, while Nevada is approximately 284,448 sq km, making Nevada 90.5% the size of New Mexico. Meanwhile, the population of New Mexico is ~2.1 million people (641,372 more people live in Nevada).
Tip: This to-scale comparison of New Mexico vs. Nevada uses the Mercator projection, which distorts the size of regions near the poles.