Most houses are in the residential areas unless you are in unicorporated Wauconda, which apparently allows chickens. I will be working to get this law changed! Here is the zoning map: http://wauconda-il.gov/wp-content/uploads/2012/03/Zoning2012_11x17-FINAL.pdf
Wauconda, IL: no chickens unless zoned Agriculture. Apparently you can keep them in unincorporated Wauconda. There are a couple of chunks in Wauconda that aren't part of the Villiage, including a section on the lake off of Garland.
Lazy Susan Farms has a small commercial egg farm at the corner...