Mandeville, LA: how dark is the sky here?
Mandeville 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. That's brighter than 24.6% of the 3,206 US cities in this dataset.
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.
The nearest darker sky to Mandeville
New Orleans, LA, about 24 miles away as the crow flies, measures in the rural band, one step darker than Mandeville. Actual driving distance will run longer than that straight-line figure.
New Orleans, LA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Mandeville compares nationally
About 12,973 people live in Mandeville, LA, sized enough to appear in this dataset of 3,206 incorporated US cities. Mandeville places 784 of 3,206 cities in this dataset's darkest-to-brightest order.