Yes. You can raise up to six female chickens on residential lots less than one acre in size; roosters are prohibited on lots that are less than one acre in size.
However, some conditions do apply (MMC 10.04.315):
* A suitable shelter that is constructed so as to discourage predators must be provided. The shelter must be maintained in good working condition.
* Shelters, pens, and similar chicken enclosures should be in the backyard set back a minimum of 20 feet from neighboring residentially occupied structures.
* Shelters, pens, and similar chicken enclosures should be kept clean and free from disagreeable odors. No organic materials furnishing food for flies shall be allowed to accumulate on the premises. All manure and other refuse must be kept in tightly covered fly-proof receptacles and disposed of at least once each week in a manner approved by the animal control officer.
* Chickens may roam freely in the backyard as long as they are contained on the premises by a fence.