- Dance Companies, Port Allen
- Data Communications Service, Equipment, Supplies & Sales, Port Allen
- Day Spas, Port Allen
- Dental Clinics, Port Allen
- Dentists, Port Allen
- Department Stores, Port Allen
- Diesel Engine Repair & Service, Port Allen
- Direct Mail Advertising, Port Allen
- Dirt, Port Allen
- Discount Stores, Port Allen - Clothing, Grocery, Furniture, Etc
- Doctors, Physicians & Surgeons, Port Allen
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- Donuts, Port Allen
- Drains, Pipes & Sewage Materials, Port Allen
- Drapery & Curtain Fabric Manufacturers, Port Allen
- Drinking Establishments, Port Allen
- Driveway, Parking Lot & Blacktop Contractors, Port Allen - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Port Allen
- Dry Cleaning & Laundry, Port Allen - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Port Allen - Installation & Repair Services
- Dump Truck, Port Allen
- Durable & Non Durable Goods & Products, Port Allen
- Durable Goods & Products, Port Allen
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