North Dakota is about 11 times smaller than Mexico.

Mexico is approximately 1,964,375 sq km, while North Dakota is approximately 178,647 sq km, making North Dakota 9.09% the size of Mexico. Meanwhile, the population of Mexico is ~129.2 million people (128.5 million fewer people live in North Dakota).
Tip: This to-scale comparison of Mexico vs. North Dakota uses the Mercator projection, which distorts the size of regions near the poles.