State size comparison
compared to
Washington is about 1.2 times bigger than Illinois.
Illinois is approximately 143,961 sq km, while Washington is approximately 172,348 sq km, making Washington 20% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (6.1 million fewer people live in Washington).
Tip:
This to-scale comparison of
Illinois
vs.
Washington
uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Washington vs. Illinois
Flip Comparison · See true size
See Washington on top of Illinois
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Quality of Life Comparison · 15 statistics
Be 21.3% more likely to live below the poverty line in Illinois
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Cost of Living Comparison · 7 categories - 2026 data
Illinois is 6.2% cheaper than Washington
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Moving from Washington to Illinois · Cost, visas & climate
Compare cost of living, salary and climate.
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City Size Comparison · See true size
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