Henderson is about 4.1 times smaller than Rome.

Rome is approximately 1,287 sq km, while Henderson (map shows its 23 named neighbourhoods; the area covers the whole city) is approximately 313 sq km, making Henderson 24.34% the size of Rome.
Tip: This to-scale comparison of Rome vs. Henderson uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.