Chickens are NOT allowed in the City limits of Marengo, IL
93.05 ANIMALS PROHIBITED
A. FARM ANIMALS: No person shall stable, keep or maintain any Prohibited Animals (See definition below) as defined in Section 14.01 herein in the City, nor shall any person ride, walk or lead such prohibited animals in the City, except by special permission granted by the City Council; provided that horses may be led through the City on a public roadway when safe to do so without disrupting traffic. And except also that the City may issue a permit for the use of any horse-drawn carriage for a particular event or ceremony.
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- 93.01 DEFINITIONS In addition to the definitions found in Appendix A of this Code, the following words and phrases shall have the meanings, and are hereby defined, as follows:
- Prohibited Animal: Pigs, swine, sheep, chickens or other fowl, cattle, horses, goats or similar animals, or any naturally wild animal, except birds or fish, whether or not bred for domestic purposes. Such animals shall, however, be permitted in zoological parks, performing animal exhibitions, educational institutions or veterinary hospitals.
We are aware that when you google AI overview gives the below information, but it is for Marengo Iowa and not Illinois:

