Country size comparison
compared to
Illinois is about 1,846 times bigger than Guernsey.
Guernsey is approximately 78 sq km, while Illinois is approximately 143,961 sq km, making Illinois 184,465% larger than Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (12.8 million more people live in Illinois).
Compare further: Illinois vs. Guernsey