City size comparison

compared to

Helena is about 10 times smaller than Oslo.

Oslo is approximately 454 sq km, while Helena (map shows its 6 named neighbourhoods; the area covers the whole city) is approximately 44 sq km, making Helena 9.79% the size of Oslo.
Tip: This to-scale comparison of Oslo vs. Helena uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Helena vs. Oslo

Flip Comparison · See true size
See Helena on top of Oslo
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Cost of Living Comparison · 7 categories - 2026 data
Oslo is 12.1% more expensive than Helena
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