Oak Park, IL Night Sky Brightness
What the night sky looks like over Oak Park, IL
Satellite radiance puts Oak Park in the suburban band. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. Only 80.6% of the 3,206 cities measured here read darker than Oak Park.
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 - the Bortle scale guide covers why.
How far Oak Park is from a meaningfully darker sky
9 miles from Oak Park, straight-line, sits Justice, IL, the nearest city here with a darker sky than Oak Park's own suburban band.
Justice, IL is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
Oak Park against the rest of the dataset
Oak Park, IL has a population of about 52,947, one of 3,206 US cities of 10,000 or more residents in this dataset. Among all 3,206 cities here, Oak Park ranks 2,569 from darkest to brightest, 1 being the darkest measured, by the sampling the methodology guide documents.