- Accounting, Auditing & Bookkeeping Services, Farmingville
- Additional Educational Opportunities, Farmingville
- Advertising, PR & Marketing Services, Farmingville
- Agricultural Insurance, Farmingville
- Agriculture, Farmingville
- Air Conditioning Repair & Service, Farmingville - HVAC - Cooling & Heating Repair
- Alarm Systems, Farmingville
- Ambulance Department, Farmingville
- American Restaurants, Farmingville
- Amusement Parks, Farmingville
- Animal Hospitals, Farmingville - Veterinary Clinic & Hospital
- Animal Shelters & Protection Agencies, Farmingville
- Antique Stores, Farmingville - Antique Mall, Dealers & Shops
- Apparel Brokers, Farmingville
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- Architects, Farmingville - Residential, Interior, Commercial, Office & Landscape Architecture Services
- Arts & Crafts Supplies & Stores, Farmingville
- Arts & Culture, Farmingville
- Asian Restaurants, Farmingville
- Athletic Facilities & Services, Farmingville
- Attorneys & Lawyers, Farmingville
- Attorneys & Lawyers, Farmingville
- Auto Body Repair & Paint Shop, Farmingville - Auto Body Shop
- Auto Customizing, Farmingville
- Auto Glass & Windshield Repair & Replacement, Farmingville - Window Tinting, etc
- Auto Insurance, Farmingville
- Auto Repair Shops & Maintenance Service, Farmingville - Auto Mechanic & Car Repair Shops
- Auto Services, Farmingville
- Automotive Access & Equipment Manufacturers, Farmingville
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