My apologies, after reading the ordinance again and speaking with the building department, I see that I misspoke.
Crest Hill residents can keep chickens/ducks in the City on private property as long as they are penned and not allowed to roam freely.
My apologies and please feel free to contact the Building Department if you have any questions.
Web Administrator, City of Crest Hill,IL
tel: 815-741-5100 │fax: 815-744-5109
I want to add that Joliet, Illinois fowl ordinances are the exact same as Crest Hill's so that may help those of you living there as well.