- Accounting, Auditing & Bookkeeping Services, Melville
- Actuarial Services, Melville
- Ad Distribution Services, Circular, Sample, Etc, Melville
- Additional Educational Opportunities, Melville
- Administrative Organizations, Melville
- Administrative Professionals, Melville
- Adoption Attorneys & Lawyers, Melville
- Adoption Attorneys & Lawyers, Melville
- Adoption Lawyers & Attorneys, Melville
- Adult & Geriatric Social Services, Melville
- Advertising Agencies, Melville
- Advertising Specialties, Melville
- Advertising, PR & Marketing Services, Melville
- Agents Brokers & Planning Services, Melville
- Agricultural Insurance, Melville
- Agriculture, Melville
- AIDS - HIV Treatment, Testing & Information Services, Melville - HIV Referral & Support
- Air Carrier Companies, Melville - Air Courier & Air Cargo Service
- Air Conditioning Repair & Service, Melville - HVAC - Cooling & Heating Repair
- Air Transportation, Except Passenger, Melville
- Airport, Melville
- Airport Parking, Melville
- Airport Transportation Services, Melville
- Alarm Systems, Melville
- Alarms, Signaling & Security Equipment & Systems, Melville
- Ambulance Department, Melville
- Amusement Parks, Melville
- Analytical Labs, Melville
- Animal Shelters & Protection Agencies, Melville
- Animals, Melville
- Apartment Building Operators, Melville
- Apartments & Buildings, Melville
- Apparel & Accessories Sporting Goods, Melville
- Appliance Repair & Service, Melville
- Arbitration & Mediation Services, Melville
- Architects, Melville - Residential, Interior, Commercial, Office & Landscape Architecture Services
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- Armored Car Service, Melville
- Art, Melville
- Art Galleries & Dealers, Melville
- Art Supplies, Melville - Art Stores
- Artists, Melville
- Artists Commercial & Graphic, Melville
- Arts & Crafts Supplies & Stores, Melville
- Arts & Culture, Melville
- Asian Restaurants, Melville
- Asphalt & Asphalt Products, Melville - Asphalt Companies, Wholesale, Manufacturers & Suppliers
- Asphalt & Paving Materials, Melville - Companies & Suppliers
- Asset Management, Melville
- Assisted Living & Elder Care Services, Melville
- Assisted Living Facilities, Melville
- Athletic Equipment Rental, Melville
- Athletic Equipment Repair & Service, Melville
- Atm Machines, Melville
- ATM Machines Sales & Service, Melville
- Attic & Basement Finishing Contractors, Melville - Basement Remodeling
- Attorneys & Lawyers, Melville
- Attorneys & Lawyers, Melville
- ATV & RV Dealers, Melville - All-Terrain & Recreational Vehicles
- Auctioneer, Melville
- Auctions, Melville - Auctioneer Services
- Audio Video Production Services, Melville
- Audio Visual Consultants, Melville - Home Theater, Audio Video Consultants & More
- Audio Visual Equipment Rental & Leasing Service, Melville
- Auto Insurance, Melville
- Auto Parts, Accessories, Equipment & Supplies, Melville
- Auto Repair Shops & Maintenance Service, Melville - Auto Mechanic & Car Repair Shops
- Auto Services, Melville
- Auto Wheels, Melville
- Automation Systems & Equipment, Melville - Industrial Automation
- Aviation Consultants, Melville - Aerospace & Airport Consulting Service
- Awards, Medals & Trophies , Melville
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