- Accounting, Auditing & Bookkeeping Services, Jamestown
- Additional Educational Opportunities, Jamestown
- Adult Care Services, Jamestown
- Adventist Churches, Jamestown
- Advertising, PR & Marketing Services, Jamestown
- Agriculture, Jamestown
- Air Transportation, Except Passenger, Jamestown
- Airlines, Jamestown
- Airport, Jamestown
- Ambulance Department, Jamestown
- Amusement Parks, Jamestown
- Animals, Jamestown
- Antique Stores, Jamestown - Antique Mall, Dealers & Shops
- Apartments & Buildings, Jamestown
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- Appraisers, Jamestown
- Art Galleries & Dealers, Jamestown
- Art Galleries French, Jamestown
- Arts & Culture, Jamestown
- Attorneys & Lawyers, Jamestown
- Attorneys & Lawyers, Jamestown
- Auctioneer, Jamestown
- Auto Body Repair & Paint Shop, Jamestown - Auto Body Shop
- Auto Customizing, Jamestown
- Auto Insurance, Jamestown
- Auto Repair Shops & Maintenance Service, Jamestown - Auto Mechanic & Car Repair Shops
- Automotive Access & Equipment Manufacturers, Jamestown
- Avon Cosmetics, Jamestown
- Awards, Medals & Trophies , Jamestown
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