District of Columbia is about 1,009 times smaller than North Dakota.

North Dakota is approximately 178,647 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.1% the size of North Dakota. Meanwhile, the population of North Dakota is ~672,591 people (70,868 fewer people live in District of Columbia).
Tip: This to-scale comparison of North Dakota vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.