- Accounting, Auditing & Bookkeeping Services, New Haven
- Adult & Geriatric Social Services, New Haven
- Advertising Agencies, New Haven
- Advertising Design & Production Services, New Haven
- Advertising, PR & Marketing Services, New Haven
- Agriculture, New Haven
- Air Conditioning Repair & Service, New Haven - HVAC - Cooling & Heating Repair
- Alcohol Distilleries, New Haven
- Ambulance Department, New Haven
- American Legions, New Haven
- Amusement Parks, New Haven
- Animal Farms, New Haven
- Animal Feeds, New Haven
- Animal Hospitals, New Haven - Veterinary Clinic & Hospital
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- Animal Training, New Haven
- Animals, New Haven
- Antique Stores, New Haven - Antique Mall, Dealers & Shops
- Apartment Building Operators, New Haven
- Arts & Culture, New Haven
- Assisted Living Facilities, New Haven
- Auto Body Repair & Paint Shop, New Haven - Auto Body Shop
- Auto Insurance, New Haven
- Auto Parts, Accessories, Equipment & Supplies, New Haven
- Auto Repair Shops & Maintenance Service, New Haven - Auto Mechanic & Car Repair Shops
- Auto Sunroof, New Haven
- Auto Transmission, New Haven - Manual & Automatic Transmissions
- Auto, Car & Truck Accessories, New Haven
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