What the night sky looks like over Mill Creek, WA
Mill Creek's sky measures suburban edge here. 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 31.1% of the 3,206 US cities in this dataset.
The number comes from orbit, not a stargazer's logbook, so treat it as an estimate of sky glow rather than a certified Bortle class.
How far Mill Creek is from a meaningfully darker sky
8 miles from Mill Creek, straight-line, sits Lake Forest Park, WA, the nearest city here with a darker sky than Mill Creek's own suburban edge band.
Lake Forest Park, WA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Mill Creek against the rest of the dataset
Mill Creek, WA has a population of about 20,993, one of 3,206 US cities of 10,000 or more residents in this dataset. Among all 3,206 cities here, Mill Creek ranks 991 from darkest to brightest, 1 being the darkest measured.