New Mexico is about 1.8 times bigger than North Dakota.

North Dakota is approximately 178,647 sq km, while New Mexico is approximately 314,310 sq km, making New Mexico 76% larger than North Dakota. Meanwhile, the population of North Dakota is ~672,591 people (1.4 million more people live in New Mexico).
Tip: This to-scale comparison of North Dakota vs. New Mexico uses the Mercator projection, which distorts the size of regions near the poles.