Wyoming is around the same size as New Zealand.

New Zealand is approximately 268,838 sq km, while Wyoming is approximately 251,489 sq km, making Wyoming 93.55% the size of New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (4.5 million fewer people live in Wyoming).
Tip: This to-scale comparison of New Zealand vs. Wyoming uses the Mercator projection, which distorts the size of regions near the poles.