Louisville/Jefferson County, KY Night Sky Brightness
Louisville/Jefferson County, KY's night sky, measured from orbit
Louisville/Jefferson County reads as suburban on this dataset's scale. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Only 73.8% of the 3,206 cities measured here read darker than Louisville/Jefferson County.
Note the source: a satellite reading of upward light, not a visual Bortle scale reading. The two measure related but different things, explained in the Bortle scale guide.
How far Louisville/Jefferson County is from a meaningfully darker sky
Mount Washington, KY, about 10 miles away as the crow flies, measures in the suburban edge band, one step darker than Louisville/Jefferson County. Actual driving distance will run longer than that straight-line figure.
Mount Washington, KY is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Louisville/Jefferson County compares nationally
Louisville/Jefferson County, KY has a population of about 640,796, one of 3,206 US cities of 10,000 or more residents in this dataset. Louisville/Jefferson County's position, 2,352 of 3,206, darkest to brightest, comes from the sampling method the methodology guide sets out.