Illinois is about 37 times bigger than South Georgia and South Sandwich Islands.

South Georgia and South Sandwich Islands is approximately 3,903 sq km, while Illinois is approximately 143,961 sq km, making Illinois 3,588% larger than South Georgia and South Sandwich Islands.
Tip: This to-scale comparison of South Georgia and South Sandwich Islands vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: Illinois vs. South Georgia and South Sandwich Islands