Trenton is about 19 times smaller than Las Vegas.

Las Vegas (map shows its 26 named neighbourhoods; the area covers the whole city) is approximately 367 sq km, while Trenton is approximately 20 sq km, making Trenton 5.36% the size of Las Vegas.
Tip: This to-scale comparison of Las Vegas vs. Trenton uses the Mercator projection, which distorts the size of regions near the poles.
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