City size comparison

compared to

Seattle is about 3.1 times bigger than Boulder.

Boulder is approximately 70 sq km, while Seattle is approximately 217 sq km, making Seattle 212% larger than Boulder.
Tip: This to-scale comparison of Boulder vs. Seattle uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Seattle vs. Boulder

Flip Comparison · See true size
See Seattle on top of Boulder
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Cost of Living Comparison · 7 categories - 2026 data
Boulder is 12.8% cheaper than Seattle
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