It depends on the type of business as well as the location of the business. Start with your town hall to find out local requirements. The State also requires that some occupations and businesses be licensed. For information on licensed occupations, visit the State of New Hampshire Occupation Index. For food service businesses, contact the New Hampshire Bureau of Food Protection at (603) 271-4673. Starting and Operating a Business in New Hampshire, by Michael D. Jenkins, Oasis Press, lists many licensing requirements also.