- Accounting, Auditing & Bookkeeping Services, Acton
- Addiction Services (Other Than Substance Abuse), Acton
- Additional Educational Opportunities, Acton
- Administrative Organizations, Acton
- Adult & Geriatric Social Services, Acton
- Advertising, PR & Marketing Services, Acton
- Agriculture, Acton
- Aluminum Products Manufacturers, Acton
- Amusement Parks, Acton
- Analytical Labs, Acton
- Anglican Churches, Acton
- Animal & Pet Food & Supplies Manufacturers, Acton
- Animal Hospitals, Acton - Veterinary Clinic & Hospital
- Antique Stores, Acton - Antique Mall, Dealers & Shops
- Apartments & Buildings, Acton
- Appraisers, Acton
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- Artificial Flowers & Plants, Acton
- Artificial Flowers Plants & Tree Manufacturers, Acton
- Arts & Crafts Supplies & Stores, Acton
- Arts & Culture, Acton
- Asian Restaurants, Acton
- Athletic Facilities & Services, Acton
- Attorneys & Lawyers, Acton
- Attorneys & Lawyers, Acton
- Auctions, Acton - Auctioneer Services
- Audio Video Repair & Service, Acton
- Auto Parts, Accessories, Equipment & Supplies, Acton
- Auto Repair Shops & Maintenance Service, Acton - Auto Mechanic & Car Repair Shops
- Auto Repair Shops - General, Acton
- Auto Salvage & Recycling, Acton
- Auto Services, Acton
- Auto Wrecking, Dismantling & Recycling, Acton
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