Here are the pertinent bits, with links to the sections of the code itself.

Sec. 10-1. – Fowl at large. No person shall allow, permit or suffer any geese, turkeys, chickens, ducks or other fowl owned by him or under his control to run at large upon any public street, avenue, alley or place within the city or allow, permit or suffer the fowl to run at large or trespass upon any private property within the city.

So, i.e., keep your poultry in your own yard.

Sec. 46-410. – Prohibited noise.  (6) Animals and birds. No person shall keep, maintain or permit upon any lot or parcel of land under his control any dog, animal or fowl which by any sound, bark or cry disturbs the peace or comfort of the neighboring inhabitants or interferes with any person for the reasonable and comfortable enjoyment of life and property.

If your neighbors complain, out goes a loud chicken.

The above two are complete quotes from the relevant sections of the code. I only quoted the parts about chickens (and other poultry) from the last section.

88.42.040. – Animal Keeping.

Where allowed by Article 2 (Urban Standards), animal keeping shall comply with the regulations of this section.

A. Type and Number of Animals Allowed.

The keeping of animals and poultry for non-commercial purposes shall be limited to the following number of animals. Any animal or number of animals other than the following shall be prohibited.

4. Five female chickens, ducks, geese, or other poultry over 12 weeks of age, or 15 chicks under 12 weeks of age

Five hens, no roosters, or fifteen chicks less than three months old.

B. Location Requirements.

1. Poultry or rabbits maintained on a property out of doors shall be kept in a fully enclosed structure located a minimum distance of 20 feet from any lot line, 50 feet from any dwelling unit, and 100 feet from any school, hospital, or similar institution.

(ord. no. 06-o6, § 1b, 8-7-06)

You can find the full municipal code here, and Azusa’s official website here.