Saint Martin is about 3.2 times smaller than District of Columbia.

District of Columbia is approximately 177 sq km, while Saint Martin is approximately 54 sq km, making Saint Martin 30.73% the size of District of Columbia. Meanwhile, the population of District of Columbia is ~601,723 people (568,931 fewer people live in Saint Martin).
Tip: This to-scale comparison of District of Columbia vs. Saint Martin uses the Mercator projection, which distorts the size of regions near the poles.