New Mexico is about 4,030 times bigger than Guernsey.

Guernsey is approximately 78 sq km, while New Mexico is approximately 314,310 sq km, making New Mexico 402,862% larger than Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (2.0 million more people live in New Mexico).
Tip: This to-scale comparison of Guernsey vs. New Mexico uses the Mercator projection, which distorts the size of regions near the poles.