District of Columbia is about 762 times smaller than Arkansas.

Arkansas is approximately 134,856 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.13% the size of Arkansas. Meanwhile, the population of Arkansas is ~2.9 million people (2.3 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Arkansas vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.