District of Columbia is about 795 times smaller than Wisconsin.

Wisconsin is approximately 140,663 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.13% the size of Wisconsin. Meanwhile, the population of Wisconsin is ~5.7 million people (5.1 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Wisconsin vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.