State size comparison
compared to
Connecticut is about 11 times smaller than Illinois.
Illinois is approximately 143,961 sq km, while Connecticut is approximately 12,548 sq km, making Connecticut 8.72% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (9.3 million fewer people live in Connecticut).
Tip:
This to-scale comparison of
Illinois
vs.
Connecticut
uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Connecticut vs. Illinois
Flip Comparison · See true size
See Connecticut on top of Illinois
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Quality of Life Comparison · 16 statistics
Be 20.0% more likely to live below the poverty line in Illinois
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Cost of Living Comparison · 7 categories - 2026 data
Illinois is 9.2% cheaper than Connecticut
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Moving from Connecticut to Illinois · Cost, visas & climate
Compare cost of living, salary and climate.
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