Mississippi is about 502 times bigger than Saint Pierre and Miquelon.

Saint Pierre and Miquelon is approximately 242 sq km, while Mississippi is approximately 121,489 sq km, making Mississippi 50,102% larger than Saint Pierre and Miquelon. Meanwhile, the population of Saint Pierre and Miquelon is ~5,257 people (3.0 million more people live in Mississippi).
Tip: This to-scale comparison of Saint Pierre and Miquelon vs. Mississippi uses the Mercator projection, which distorts the size of regions near the poles.