City size comparison

compared to

Madrid is about 9 times bigger than Boulder.

Boulder is approximately 70 sq km, while Madrid is approximately 604 sq km, making Madrid 768% larger than Boulder.
Tip: This to-scale comparison of Boulder vs. Madrid uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Madrid vs. Boulder

Flip Comparison · See true size
See Madrid on top of Boulder
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Cost of Living Comparison · 7 categories - 2026 data
Boulder is 43.2% more expensive than Madrid
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