Svalbard is about 2.3 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Svalbard is approximately 62,045 sq km, making Svalbard 43.1% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (12.8 million fewer people live in Svalbard).
Tip: This to-scale comparison of Illinois vs. Svalbard uses the Mercator projection, which distorts the size of regions near the poles.