- Accounting, Auditing & Bookkeeping Services, Groton
- Acupressure & Acupuncture Specialists, Groton
- Additional Educational Opportunities, Groton
- Adult Care Services, Groton
- Advertising Periodical Publishers Representative, Groton
- Advertising Representatives, Groton - Media Representatives
- Advertising, PR & Marketing Services, Groton
- Agents Brokers & Planning Services, Groton
- Agricultural Crops, Groton
- Agriculture, Groton
- Alarms, Signaling & Security Equipment & Systems, Groton
- Animal Hospitals, Groton - Veterinary Clinic & Hospital
- Antique Stores, Groton - Antique Mall, Dealers & Shops
- Apartment Building Operators, Groton
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- Apartments & Buildings, Groton
- Arbitration & Mediation Services, Groton
- Art, Groton
- Art Galleries & Dealers, Groton
- Artists, Groton
- Artists Commercial & Graphic, Groton
- Arts & Crafts Supplies & Stores, Groton
- Arts & Culture, Groton
- Asian Restaurants, Groton
- Attorneys & Lawyers, Groton
- Attorneys & Lawyers, Groton
- Auto Body Repair & Paint Shop, Groton - Auto Body Shop
- Auto Repair Shops & Maintenance Service, Groton - Auto Mechanic & Car Repair Shops
- Auto Services, Groton
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