As we previously did articles on the 2024 solar eclipse for the several state parks, and figure that there is an amazing opportunity for mapping those state parks to their Bortle Scale values. With the help of https://www.lightpollutionmap.info, we created the following table to provide information about the entire state parks for Illinois in regards to light pollution and astronomy.

Item	How Many
Number Of State Parks	83
Number of Different Bortle Scales	6
Level 1 Bortle Scale State Parks	0
Level 2 Bortle Scale State Parks	0
Level 3 Bortle Scale State Parks	6
Level 4 Bortle Scale State Parks	26
Level 5 Bortle Scale State Parks	30
Level 6 Bortle Scale State Parks	7
Level 7 Bortle Scale State Parks	9
Level 8 Bortle Scale State Parks	5

Map

Here is a show of the colors of the markers, to know how to read the map.

Color	Bortle Scale
Black	Level 1
Dark Purple	Level 2
Blue	Level 3
Green	Level 4
Yellow	Level 5
Orange	Level 6
Red	Level 7
White	Level 8

To learn more about the Bortle Scale, check out this article. The Illinois State Parks official website can be found here.