- Accounting, Auditing & Bookkeeping Services, Mattituck
- Additional Educational Opportunities, Mattituck
- Adult & Geriatric Social Services, Mattituck
- Adult Care Services, Mattituck
- Advertising Design & Production Services, Mattituck
- Advertising, PR & Marketing Services, Mattituck
- Aerial Advertising Services, Mattituck
- Agriculture, Mattituck
- Air Conditioning Repair & Service, Mattituck - HVAC - Cooling & Heating Repair
- Aircraft Maintenance & Service, Mattituck
- Airport, Mattituck
- Airports & Flying Fields, Mattituck
- Alarm Systems, Mattituck
- American Restaurants, Mattituck
- Animals, Mattituck
- Antique Stores, Mattituck - Antique Mall, Dealers & Shops
- Appraisers, Mattituck
- Architects, Mattituck - Residential, Interior, Commercial, Office & Landscape Architecture Services
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- Art Galleries & Dealers, Mattituck
- Art Supplies, Mattituck - Art Stores
- Arts & Crafts Supplies & Stores, Mattituck
- Arts & Culture, Mattituck
- Asian Restaurants, Mattituck
- Athletic & Sports Facilities Contractors, Mattituck
- Athletic Equipment Rental, Mattituck
- Athletic Equipment Repair & Service, Mattituck
- Atm Machines, Mattituck
- Attorneys & Lawyers, Mattituck
- Attorneys & Lawyers, Mattituck
- Auctioneers, Mattituck
- Auto Body Repair & Paint Shop, Mattituck - Auto Body Shop
- Auto Insurance, Mattituck
- Auto Parts, Accessories, Equipment & Supplies, Mattituck
- Auto Repair Shops & Maintenance Service, Mattituck - Auto Mechanic & Car Repair Shops
- Auto Services, Mattituck
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