- Dairy Products - Wholesale & Retail, Locust Valley
- Dams, Waterways, & Docks Contractors, Locust Valley
- Dance Companies, Locust Valley
- Day Camps, Locust Valley
- Day Spas, Locust Valley
- Decorating & Designing Services, Locust Valley
- Delicatessen Restaurants, Locust Valley
- Dentists, Locust Valley
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- Developmental Disabilities, Locust Valley
- Disabled Persons Assistive Services, Locust Valley
- Drinking Establishments, Locust Valley
- Driveway Contractors - Build, Repair, Sealing, Locust Valley - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Drugs & Pharmaceutical Supplies, Locust Valley
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Locust Valley
- Dry Cleaning & Laundry, Locust Valley - Dry Cleaners
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