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

Saint Martin is approximately 54 sq km, while District of Columbia is approximately 177 sq km, making District of Columbia 225% larger than Saint Martin. Meanwhile, the population of Saint Martin is ~32,792 people (568,931 more people live in District of Columbia).
Tip: This to-scale comparison of Saint Martin vs. District of Columbia uses the Mercator projection, which distorts the size of regions near the poles.