Alaska is about 18,992 times bigger than Guernsey.

Guernsey is approximately 78 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 1,899,064% larger than Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (642,740 more people live in Alaska).
Tip: This to-scale comparison of Guernsey vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.