Coyotes have been in the Lake County IL area since before the 1800's, and it is not unusual to see Coyotes in the Glenmore Woods area from time to time. Many residents have even heard Coyotes at night. Coyotes have been given a little more attention because there have been news stories of Coyotes in the Chicago city limits, specifically in Wrigleyville.
The Lake County Illinois Forest Preserve has a very good guide on Coyotes than can be found here. Lake County also has a "Coyotes in Lake County: Who to Call and When" guide. This guide tells you who to call if a coyote is acting aggressively toward a human or a pet within a Forest Preserve, or if coyote is in a confined area and is unable to leave.