Idaho is about 9 times bigger than Vermont.

Vermont is approximately 23,956 sq km, while Idaho is approximately 214,314 sq km, making Idaho 795% larger than Vermont. Meanwhile, the population of Vermont is ~625,741 people (941,841 more people live in Idaho).
Tip: This to-scale comparison of Vermont vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.