Brentwood, TN: how dark is the sky here?

Brentwood 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 19.8% 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.

Where to go for a darker sky near Brentwood

44 miles from Brentwood, straight-line, sits Hartsville/Trousdale County, TN, the nearest city here with a darker sky than Brentwood's own suburban edge band.

Hartsville/Trousdale County, TN is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.

How Brentwood compares nationally

Brentwood, TN has a population of about 45,525, one of 3,206 US cities of 10,000 or more residents in this dataset. Brentwood places 633 of 3,206 cities in this dataset's darkest-to-brightest order.