New Zealand is around the same size as Wyoming.

Wyoming is approximately 251,489 sq km, while New Zealand is approximately 268,838 sq km, making New Zealand 7% larger than Wyoming. Meanwhile, the population of Wyoming is ~563,626 people (4.5 million more people live in New Zealand).
Tip: This to-scale comparison of Wyoming vs. New Zealand uses the Mercator projection, which distorts the size of regions near the poles.