Village, county and wildlife organizations all have recommendations about not leaving food out, keeping pets closely observed at all times, etc. Coyotes are naturally fearful of humans and rarely dangerous to people, unless they lose that fear by being purposely fed and interacted with.
The Village of Vernon Hills has coyote information on their website here:
The Lake County Forest Preserves has an FAQ about coyotes here:
Flint Creek wildlife has some good information on coyotes as well:
Lake County has a "who to call and when" document here:
It's important to note that local agencies do not respond to calls about nearby coyote dens or calls about coyotes walking through neighborhoods, open areas or wooded areas.
Coyotes are protected by Illinois state law and, as such, it is illegal for members of the public to harm, trap or kill coyotes. . Expensive “relocation” services do nothing but open up the territory for it to be filled by another nearby coyote - and there are many in the area.
The key to living with coyotes is remembering that they are naturally afraid of people. The most effective way to prevent a bad encounter with a coyote is to reinforce this natural fear through your behavior. Never approach a coyote, let your pet approach it, or feed it. If you are approached by a coyote, or it comes into your vicinity, scare it away by shouting at it and waving your arms over your head. Using an air horn or whistle will also help scare coyotes away from approaching you. These actions will reinforce the coyote’s natural fear of people and help teach it that our community property is not available territory.