In Southinton, you can have up to 12 hens, no roosters. Check section 3 page 4 of the town zoning regulations (available online) for the specific space requirements.
this is the only thing that is in the reg's for Southington.
B. The keeping of a family flock of chickens (limit 12), subject to the following conditions:
1. The use shall be confined to an enclosure having a total area of not more than 400 square feet.
2. Any structure used for this purpose is to be located not less than 30 feet from any lot line, and 100 feet from any street line.
3. No roosters.1