City size comparison

compared to

Rome is about 18 times bigger than Boulder.

Boulder is approximately 70 sq km, while Rome is approximately 1,287 sq km, making Rome 1,749% larger than Boulder.
Tip: This to-scale comparison of Boulder vs. Rome uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Rome vs. Boulder

Flip Comparison · See true size
See Rome on top of Boulder
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Cost of Living Comparison · 7 categories - 2026 data
Boulder is 42.0% more expensive than Rome
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