Massachusetts is about 115 times bigger than District of Columbia.

District of Columbia is approximately 177 sq km, while Massachusetts is approximately 20,306 sq km, making Massachusetts 11,372% larger than District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (5.9 million more people live in Massachusetts).
Tip: This to-scale comparison of District of Columbia vs. Massachusetts uses the Mercator projection, which distorts the size of regions near the poles.