District of Columbia is about 1,663 times smaller than Arizona.

Arizona is approximately 294,312 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 0.06% the size of Arizona. Meanwhile, the population of Arizona is ~6.4 million people (5.8 million fewer people live in District of Columbia).
Tip: This to-scale comparison of Arizona vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.