i live in Fair Oaks - we just moved here last April from Los Angeles. i did a LOT of research before we bought this house as it was imperative that we live somewhere where we would not have to worry about our chickens being taken away. i can't recall if it was zoning or code enforcement who gave me the information. But we were told that no chickens are allowed at all in the City of Sacramento, but in the unincorporated portions of Sacramento County you must have 10,000 square feet or more and then you can have as many chickens (or turkeys or ducks or geese or other fowl) as you want (keeping in mind that they must be kept in clean conditions) and you can keep any other barnyard animal that will not exceed 75 pounds at adult weight. i think the other contingency was that they must be housed at least 10 feet from any neighboring property line.
gorgeousarmageddon - the link you provided to that short article on the conditional use permit is dated 2006 at the bottom, and i have not heard of that. However, my friend recently said she saw an article in the paper that they may soon be implementing ordinances restricting the number of roosters. She said the article suggested that this is being implemented due to a large number of cock-fighting rings in the area (who knew?).
In Los Angeles County they don't restrict you on your land size, but do require that you house your hens at least 20 feet from your residence and 35 feet from any other residence (not property line, but your neighbor's actual house). If you have roosters or other loud fowl you must have 100 feet between their housing and any of your neighbor's residences.
We had a dinky yard in L.A., but most neighbors didn't know we had chickens until i told them. My closest neighbor (whose bedroom window was like 10 feet from my chicken coop) was totally cool with me having my girls. It may have been a different story if i had kept any of the roosters i hatched.
i would be interested in helping with letter writing or anything else to help others have chickens. Really, as long as people use common sense and keep their coops clean, there shouldn't be a problem. When i lived in West Sacramento 8 years ago i was told no chickens allowed. Now they allow everyone to keep up to 4 hens, no lot size or setback requirements at all. So, things are changing as more people want to keep a backyard flock.