North Dakota is about 7 times bigger than Vermont.

Vermont is approximately 23,956 sq km, while North Dakota is approximately 178,647 sq km, making North Dakota 646% larger than Vermont. Meanwhile, the population of Vermont is ~625,741 people (46,850 more people live in North Dakota).
Tip: This to-scale comparison of Vermont vs. North Dakota uses the Mercator projection, which distorts the size of regions near the poles.