Nebraska is around the same size as North Dakota.

North Dakota is approximately 178,647 sq km, while Nebraska is approximately 199,099 sq km, making Nebraska 11% larger than North Dakota. Meanwhile, the population of North Dakota is ~672,591 people (1.2 million more people live in Nebraska).
Tip: This to-scale comparison of North Dakota vs. Nebraska uses the Mercator projection, which distorts the size of regions near the poles.