Las Vegas is about 26,765 times smaller than United States.

United States is approximately 9,833,517 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 0.0% the size of United States.
Tip: This to-scale comparison of United States vs. Las Vegas uses the Mercator projection, which distorts the size of regions near the poles.
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