Many municipalities in Illinois do not allow chickens also. It is an uphill battle to get things changed. It is like trying to get little marxists to give up control over the people. I know some communities did succeed, but few.
In some of the suburbs here in Illinois, chickens are prohibited, but quail are allowed.
I think the major reason for many chicken prohibition, is the potential for Rooster fighting. The city councils just broad blanket rule,,,, NO CHICKENS,, and nothing further is said.
I am of course very much opposed to rooster fighting,, but there are many individuals that would do such a cruel act. Mainly with the gambling involved.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,and