Boston is about 2.5 times smaller than Henderson.

Henderson (map shows its 23 named neighbourhoods; the area covers the whole city) is approximately 313 sq km, while Boston is approximately 124 sq km, making Boston 39.57% the size of Henderson.
Tip: This to-scale comparison of Henderson vs. Boston 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.