Helena is about 1.4 times smaller than Newark.

Newark (map shows its 20 named neighbourhoods; the area covers the whole city) is approximately 63 sq km, while Helena (map shows its 6 named neighbourhoods; the area covers the whole city) is approximately 44 sq km, making Helena 71.11% the size of Newark.
Tip: This to-scale comparison of Newark vs. Helena uses the Mercator projection, which distorts the size of regions near the poles.
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