Saint Barthelemy is about 7 times smaller than District of Columbia.

District of Columbia is approximately 177 sq km, while Saint Barthelemy is approximately 25 sq km, making Saint Barthelemy 14.12% the size of District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (594,620 fewer people live in Saint Barthelemy).
Tip: This to-scale comparison of District of Columbia vs. Saint Barthelemy uses the Mercator projection, which distorts the size of regions near the poles.