- Dairy Products - Wholesale & Retail, Ronkonkoma
- Dams, Waterways, & Docks Contractors, Ronkonkoma
- Dance Companies, Ronkonkoma
- Data Communications Service, Equipment, Supplies & Sales, Ronkonkoma
- Data Processing Services, Ronkonkoma
- Day Spas, Ronkonkoma
- Decorating & Designing Services, Ronkonkoma
- Delicatessen Restaurants, Ronkonkoma
- Delivery & Errand Services, Ronkonkoma
- Dental Supplies & Equipment, Ronkonkoma
- Dentists, Ronkonkoma
- Department Stores, Ronkonkoma
- Developmental Children Services, Ronkonkoma
- Diesel Engine, Ronkonkoma
- Digital Printing & Imaging Service, Ronkonkoma
- Dim Sum Restaurants, Ronkonkoma
- Diner Restaurants, Ronkonkoma
- Direct Mail Advertising, Ronkonkoma
- Direct Mail Advertising Services, Ronkonkoma
- Dirt, Ronkonkoma
- Disability And Social Security Attorneys & Lawyers, Ronkonkoma
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- Disc Jockey Equipment & Supplies, Ronkonkoma
- Disc Jockeys, Ronkonkoma
- Discount Stores, Ronkonkoma - Clothing, Grocery, Furniture, Etc
- Divorce & Family Law Attorneys & Lawyers, Ronkonkoma
- Doctors, Physicians & Surgeons, Ronkonkoma
- Doll Houses, Ronkonkoma
- Dolls, Doll Houses & Accessories , Ronkonkoma
- Donuts, Ronkonkoma
- Door & Gate Operating Devices, Ronkonkoma
- Drainage Contractors, Ronkonkoma - Install & Repair Drainage Systems
- Drinking Establishments, Ronkonkoma
- Driveway, Parking Lot & Blacktop Contractors, Ronkonkoma - Construction, Repair & Maintenance
- Drugs & Pharmaceutical Supplies, Ronkonkoma
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Ronkonkoma
- Dry Cleaning & Laundry, Ronkonkoma - Dry Cleaners
- Drywall Contractors, Ronkonkoma - Drywall Repair & Installation Services
- Duct & Duct Fittings, Ronkonkoma
- Duct Work & Duct Supplies & Equipment, Ronkonkoma
- Durable & Non Durable Goods & Products, Ronkonkoma
- Durable Goods & Products, Ronkonkoma
- Dwelling Operators Except Apartment, Ronkonkoma
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