Maine is about 2.5 times smaller than Nebraska.

Nebraska is approximately 199,099 sq km, while Maine is approximately 79,931 sq km, making Maine 40.15% the size of Nebraska. Meanwhile, the population of Nebraska is ~1.8 million people (497,980 fewer people live in Maine).
Tip: This to-scale comparison of Nebraska vs. Maine uses the Mercator projection, which distorts the size of regions near the poles.