Also work at home laws vary by city. The easiest way is to go on your city's website and go down to permits. It should tell you if you need a permit to work at home in your area.
Call the town and ask them to fax you the information. Most are pretty good at doing that. Some will make you come in person to get a copy. Although zoning terms can be the same, I only ever use the information for zoning from the exact town of the property.
Zoning Codes in various counties