New Mexico is about 3,081 times bigger than Montserrat.

Montserrat is approximately 102 sq km, while New Mexico is approximately 314,310 sq km, making New Mexico 308,047% larger than Montserrat. Meanwhile, the population of Montserrat is ~5,414 people (2.1 million more people live in New Mexico).
Tip: This to-scale comparison of Montserrat vs. New Mexico uses the Mercator projection, which distorts the size of regions near the poles.