Have there been coyote bites or attacks on humans in the Chicago area?

No, there has not been a single coyote bite or attack reported on humans in northeastern Illinois. Recent media reports of coyote bites (a 49 year old man in Aurora and a 3 year old child in Columbus Park) were later proven instead to have been the result of domestic dogs. Domestic dog bites are far more common than bites by wild animals. If you see an animal that resembles a coyote, do not attempt to feed it. Whether domestic dog or coyote, animals wandering at large should not be approached. If you are not sure, call your local animal control or police department. Report any bite by an animal promptly.

Former research associate Justin Brown, after just catching 434 for collaring

Coyote 434 is a good example of how human behaviors, such as feeding wildlife, can result in coyotes becoming a nuisance. 434 was captured on February 18, 2010, in a marsh surrounded by a subdivision and miles of urbanization. She was a young female, approximately 10 months old, and weighed 13.1 kg. Although this was the peak of the breeding season, she was not in breeding condition. A GPS collar was placed on coyote 434, which means that she was located by satellites on an intensive schedule (at times, this was every 10 minutes, other times every hour).