- Accounting, Auditing & Bookkeeping Services, Sayville
- Acupressure & Acupuncture Specialists, Sayville
- Additional Educational Opportunities, Sayville
- Administrative Organizations, Sayville
- Adult & Geriatric Social Services, Sayville
- Adult Entertainment, Sayville
- Advertising, PR & Marketing Services, Sayville
- Aerial Photographers, Sayville
- Agricultural Insurance, Sayville
- Agriculture, Sayville
- Air Conditioning Repair & Service, Sayville - HVAC - Cooling & Heating Repair
- Airline Tickets Agencies, Sayville
- Airlines, Sayville
- Airport, Sayville
- Airport Parking, Sayville
- Airport Transportation Services, Sayville
- Alarm Systems, Sayville
- Alarms, Signaling & Security Equipment & Systems, Sayville
- Ambulance Department, Sayville
- American Legions, Sayville
- American Restaurants, Sayville
- Amusement Parks, Sayville
- Animal Hospitals, Sayville - Veterinary Clinic & Hospital
- Animals, Sayville
- Antique Stores, Sayville - Antique Mall, Dealers & Shops
- Apartment Building Operators, Sayville
- Apartments & Buildings, Sayville
- Apparel Manufacturers, Sayville
- Appliance Repair & Service, Sayville
- Appraisers, Sayville
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- Appraisers Estate & Insurance Fine Arts Jewelry, Sayville
- Architects, Sayville - Residential, Interior, Commercial, Office & Landscape Architecture Services
- Architects Commercial & Industrial, Sayville
- Armored Car Service, Sayville
- Art, Sayville
- Art Galleries & Dealers, Sayville
- Artists, Sayville
- Artists Fine Arts, Sayville
- Arts & Crafts Materials & Supplies Manufacturers, Sayville
- Arts & Crafts Organizations & Information, Sayville
- Arts & Crafts Supplies & Stores, Sayville
- Arts & Culture, Sayville
- Asian Restaurants, Sayville
- Asphalt & Asphalt Products, Sayville - Asphalt Companies, Wholesale, Manufacturers & Suppliers
- Asphalt & Paving Materials, Sayville - Companies & Suppliers
- Assembly Of God Church, Sayville
- Athletic & Dance Shoes & Clothes, Sayville
- Athletic Equipment Rental, Sayville
- Athletic Equipment Repair & Service, Sayville
- Atm Machines, Sayville
- ATM Machines Sales & Service, Sayville
- Attorneys & Lawyers, Sayville
- Attorneys & Lawyers, Sayville
- Auto Body Repair & Paint Shop, Sayville - Auto Body Shop
- Auto Insurance, Sayville
- Auto Parts, Accessories, Equipment & Supplies, Sayville
- Auto Repair Shops & Maintenance Service, Sayville - Auto Mechanic & Car Repair Shops
- Auto Repair Shops - General, Sayville
- Auto Services, Sayville
- Automotive Access & Equipment Manufacturers, Sayville
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