Arkansas is about 762 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Arkansas is approximately 134,856 sq km, making Arkansas 76,090% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (2.3 million more people live in Arkansas).
Tip: This to-scale comparison of District of Columbia vs. Arkansas uses the Mercator projection, which distorts the size of regions near the poles.