State size comparison
Illinois is about 1.2 times bigger than Pennsylvania.
Pennsylvania is approximately 116,075 sq km, while Illinois is approximately 143,961 sq km, making Illinois 24% larger than Pennsylvania. Meanwhile, the population of Pennsylvania is ~12.7 million people (128,253 more people live in Illinois).
This to-scale comparison of Pennsylvania vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more. Note: Try dragging the outline to reposition.