City size comparison

compared to

Boulder is around the same size as Arlington.

Arlington (map shows its 62 named neighbourhoods; the area covers the whole city) is approximately 67 sq km, while Boulder is approximately 70 sq km, making Boulder 3% larger than Arlington.
Tip: This to-scale comparison of Arlington vs. Boulder uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Boulder vs. Arlington

Flip Comparison · See true size
See Boulder on top of Arlington
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Cost of Living Comparison · 7 categories - 2026 data
Arlington is 7.3% more expensive than Boulder
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