- Accounting, Auditing & Bookkeeping Services, Newtonville
- Additional Educational Opportunities, Newtonville
- Adoption Agencies & Services, Newtonville
- Adoption Attorneys & Lawyers, Newtonville
- Adoption Attorneys & Lawyers, Newtonville
- Adoption Lawyers & Attorneys, Newtonville
- Adult & Geriatric Social Services, Newtonville
- Advertising Agencies, Newtonville
- Advertising Specialties, Newtonville
- Advertising, PR & Marketing Services, Newtonville
- Agriculture, Newtonville
- Alarms, Signaling & Security Equipment & Systems, Newtonville
- Alcohol & Drug Prevention Education, Newtonville
- Alternative Medicine, Newtonville
- Ambulance Department, Newtonville
- Antique Stores, Newtonville - Antique Mall, Dealers & Shops
- Apartment Building Operators, Newtonville
- Apartments & Buildings, Newtonville
- Apparel Design & Decorator Services, Newtonville
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- Appraisers, Newtonville
- Arbitration & Mediation Services, Newtonville
- Architects, Newtonville - Residential, Interior, Commercial, Office & Landscape Architecture Services
- Art Related Services, Newtonville
- Arts & Crafts Supplies & Stores, Newtonville
- Arts & Culture, Newtonville
- Asbestos Removal & Abatement Services, Newtonville
- Asian Restaurants, Newtonville
- Assembly & Fabricating Service , Newtonville
- Athletic & Dance Shoes & Clothes, Newtonville
- Attorneys & Lawyers, Newtonville
- Attorneys & Lawyers, Newtonville
- Auto Body Paint Equipment & Supplies, Newtonville
- Auto Body Repair & Paint Shop, Newtonville - Auto Body Shop
- Auto Parts, Accessories, Equipment & Supplies, Newtonville
- Auto Repair Shops & Maintenance Service, Newtonville - Auto Mechanic & Car Repair Shops
- Auto Repair Shops - General, Newtonville
- Auto Services, Newtonville
- Autograph & Manuscript Dealers, Newtonville
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