Nebraska is about 1,125 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Nebraska is approximately 199,099 sq km, making Nebraska 112,385% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (1.2 million more people live in Nebraska).
Tip: This to-scale comparison of District of Columbia vs. Nebraska uses the Mercator projection, which distorts the size of regions near the poles.