South Elgin, IL: how dark is the sky here?
South Elgin reads as suburban on this dataset's scale. Light dome dominates much of the sky. Only the brightest stars and planets stand out clearly. That's brighter than 45.7% 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 South Elgin
The closest place in this dataset with a meaningfully darker sky is St. Charles, IL, roughly 5 miles away in a straight line, rated suburban edge. Road distance will be more.
St. Charles, IL is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How South Elgin compares nationally
South Elgin, IL counts roughly 24,921 residents, among the 3,206 US cities this site tracks. South Elgin places 1,456 of 3,206 cities in this dataset's darkest-to-brightest order.