Tennessee is about 603 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Tennessee is approximately 106,752 sq km, making Tennessee 60,212% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (5.7 million more people live in Tennessee).
Tip: This to-scale comparison of District of Columbia vs. Tennessee uses the Mercator projection, which distorts the size of regions near the poles.