City size comparison

compared to

Boulder is about 23 times smaller than London.

London (including the 32 boroughs of greater London) is approximately 1,572 sq km, while Boulder is approximately 70 sq km, making Boulder 4.43% the size of London.
Tip: This to-scale comparison of London vs. Boulder uses the Mercator projection, which distorts the size of regions near the poles.
Share

Compare further: Boulder vs. London

Flip Comparison · See true size
See Boulder on top of London
→
Cost of Living Comparison · 7 categories - 2026 data
London is 29.5% more expensive than Boulder
→
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.
Download on the App Store GET IT ON Google Play