The Williamson County Sheriff's Office said on Facebook that the black bear was seen at 6:10 a.m. in the area of Galatia Post and Angelville roads in the eastern part of Williamson County.
The county is just outside of Carbondale.
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Police said it was a confirmed sighting with multiple witnesses.
They asked the public not to approach the bear, and call the Williamson County Sheriff's Office at 618-997-6541, if they see it.
The Illinois Department of Natural Resources says if you see a black bear, don't run. Instead, make noise and look as large as possible.
Visit wildlifeillinois.org for more information.