Las Vegas is about 1.6 times smaller than Columbus.

Columbus is approximately 574 sq km, while Las Vegas (map shows its 26 named neighbourhoods; the area covers the whole city) is approximately 367 sq km, making Las Vegas 64.03% the size of Columbus.
Tip: This to-scale comparison of Columbus vs. Las Vegas uses the Mercator projection, which distorts the size of regions near the poles.
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