Henderson, NV: how dark is the sky here?
Henderson reads as suburban edge on this dataset's scale. A noticeable glow near the horizon. Brighter stars and constellations are easy to pick out; the Milky Way is washed out. Only 13.6% of the 3,206 cities measured here read darker than Henderson.
This comes from a satellite measuring light radiating upward, not a person's eyes on the ground, so it isn't the same as a Bortle class, though the two track each other closely.
Where to go for a darker sky near Henderson
The closest place in this dataset with a meaningfully darker sky is Mesquite, NV, roughly 75 miles away in a straight line, rated rural. Road distance will be more.
Mesquite, NV is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Henderson compares nationally
About 350,039 people live in Henderson, NV, sized enough to appear in this dataset of 3,206 incorporated US cities. Henderson places 436 of 3,206 cities in this dataset's darkest-to-brightest order.