District of Columbia is about 1,415 times smaller than Michigan.

Michigan is approximately 250,493 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.07% the size of Michigan. Meanwhile, the population of Michigan is ~9.9 million people (9.3 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Michigan vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.