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

District of Columbia is approximately 177 sq km, while Arizona is approximately 294,312 sq km, making Arizona 166,178% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (5.8 million more people live in Arizona).
Tip: This to-scale comparison of District of Columbia vs. Arizona uses the Mercator projection, which distorts the size of regions near the poles.