I live in Sedro-Woolley, IN city limits, and I have chickens on less than an acre, about .15ac in fact. I haven't been able to find the law quoted above, anywhere.
I know this is an old thread but this is all I can currently find in the city codes on their web site. I have talked to the code enforcement officer and gotten the answer that if the neighbors don't complain, they don't care, but dealing with a few disputes on other topics, I can say that even when there is a violation and neighbors do complain, no one is really interested in "enforcing" anything. Give your neighbors some eggs, don't keep roosters, keep 'em in your own yard. You'll be fine. And doing better than 50% of the dog owners in this town.
6.12.040 Maintaining offensive conditionsAt large.
It is unlawful for any person, firm, or corporation to maintain any stable, pen, lot, place, or premises in which any horses, cattle, hogs, sheep, goats, mink, fox, chinchilla, or any other animals, or in which any chickens, ducks, or other fowl or poultry may be confined or kept in such manner as to be nauseous, foul, or offensive to any community, neighbor, family, or person, or to allow such animals to roam at large within the city limits. (Ord. 828 § 4, 1976)
And if anyone can give me the code number of the quote about the acreage, I would really appreciate it.
Also, if the OP doesn't live in city limits, Sedro-Woolley codes don't apply, it is then up to the county. Then your concern would be setbacks from water ways and raparian zones and stuff.