- Accounting, Auditing & Bookkeeping Services, Locust Valley
- Additional Educational Opportunities, Locust Valley
- Adult & Geriatric Social Services, Locust Valley
- Advertising Agencies, Locust Valley
- Advertising, PR & Marketing Services, Locust Valley
- Agricultural Insurance, Locust Valley
- Agriculture, Locust Valley
- Alarm Systems, Locust Valley
- Ambulance Department, Locust Valley
- American Legions, Locust Valley
- Anglican Churches, Locust Valley
- Animal Hospitals, Locust Valley - Veterinary Clinic & Hospital
- Antique Stores, Locust Valley - Antique Mall, Dealers & Shops
- Apartment Building Operators, Locust Valley
- Apparel Manufacturers, Locust Valley
- Appliance Parts, Locust Valley
- Appliance Repair & Service, Locust Valley
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- Architects, Locust Valley - Residential, Interior, Commercial, Office & Landscape Architecture Services
- Aromatherapy & Candle Stores, Locust Valley
- Art Galleries & Dealers, Locust Valley
- Arts & Crafts Supplies & Stores, Locust Valley
- Arts & Culture, Locust Valley
- Assisted Living Facilities, Locust Valley
- Atm Machines, Locust Valley
- ATM Machines Sales & Service, Locust Valley
- Attorneys & Lawyers, Locust Valley
- Attorneys & Lawyers, Locust Valley
- Auto Customizing, Locust Valley
- Auto Insurance, Locust Valley
- Auto Parts, Accessories, Equipment & Supplies, Locust Valley
- Auto Repair Shops & Maintenance Service, Locust Valley - Auto Mechanic & Car Repair Shops
- Auto Repair Shops - General, Locust Valley
- Auto Services, Locust Valley
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