Saint Barthelemy is about 10,020 times smaller than Michigan.

Michigan is approximately 250,493 sq km, while Saint Barthelemy is approximately 25 sq km, making Saint Barthelemy 0.01% the size of Michigan. Meanwhile, the population of Michigan is ~9.9 million people (9.9 million fewer people live in Saint Barthelemy).
Tip: This to-scale comparison of Michigan vs. Saint Barthelemy uses the Mercator projection, which distorts the size of regions near the poles.