- Accounting, Auditing & Bookkeeping Services, Newton Center
- Acupressure & Acupuncture Specialists, Newton Center
- Additional Educational Opportunities, Newton Center
- Administrative Professionals, Newton Center
- Adult & Geriatric Social Services, Newton Center
- Adult Care Services, Newton Center
- Advertising Agencies, Newton Center
- Advertising, PR & Marketing Services, Newton Center
- Agriculture, Newton Center
- Alcohol & Drug Prevention Education, Newton Center
- Antique Stores, Newton Center - Antique Mall, Dealers & Shops
- Apartment Building Operators, Newton Center
- Apartments & Buildings, Newton Center
- Appraisers, Newton Center
- Architects, Newton Center - Residential, Interior, Commercial, Office & Landscape Architecture Services
- Art Galleries & Dealers, Newton Center
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- Arts & Crafts Supplies & Stores, Newton Center
- Arts & Culture, Newton Center
- Asian Restaurants, Newton Center
- Assisted Living Facilities, Newton Center
- Athletic Facilities & Services, Newton Center
- Attorneys & Lawyers, Newton Center
- Attorneys & Lawyers, Newton Center
- Auctions, Newton Center - Auctioneer Services
- Audiologists, Newton Center - Audiology Doctors, Physicians & Surgeons
- Auto Body Repair & Paint Shop, Newton Center - Auto Body Shop
- Auto Driving Schools, Newton Center
- Auto Loans, Newton Center
- Auto Parts, Accessories, Equipment & Supplies, Newton Center
- Auto Repair Shops & Maintenance Service, Newton Center - Auto Mechanic & Car Repair Shops
- Auto Services, Newton Center
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