Iowa is about 2,660 times bigger than Saint Martin.

Saint Martin is approximately 54 sq km, while Iowa is approximately 144,701 sq km, making Iowa 265,894% larger than Saint Martin. Meanwhile, the population of Saint Martin is ~32,792 people (3.0 million more people live in Iowa).
Tip: This to-scale comparison of Saint Martin vs. Iowa uses the Mercator projection, which distorts the size of regions near the poles.