City size comparison

compared to

London is about 23 times bigger than Boulder.

Boulder is approximately 70 sq km, while London (including the 32 boroughs of greater London) is approximately 1,572 sq km, making London 2,158% larger than Boulder.
Tip: This to-scale comparison of Boulder vs. London uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: London vs. Boulder

Flip Comparison · See true size
See London on top of Boulder
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Cost of Living Comparison · 7 categories - 2026 data
Boulder is 10.8% cheaper than London
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