If your town does not have ordinances, then it is the county or state law that you should follow. That is the case for me, and it's a bit of a weird situation. Since there are no local laws, state law tells me that it is illegal to have chickens on a lot my size (less than 5 acres). However, enforcement of state law resides with the county sherriff. Local law enforcement has plenty of other things to do, so they do not have a chicken squad that cruises the area seeking to enforce the letter of the law. I was told that the only time the law would be enforced is if the sherriff were called to my property on a nusince complaint related to the chickens (noise, smell, etc). I suppose they could enforce it if they were called toi my property on some other issue, but that is rather unlikely.
ETA: Ridgerunner (post below) is correct. You should call the animal enforcement officer. That's what I did, and they directed me to my local zoning official. Very helpful fellow, gave me the information I asked for. Like Ridgerunner, I didn't want to go all in only to find that I couldn't have chickens.