- Dairy Farms, Huntsville
- Dairy Products - Wholesale & Retail, Huntsville
- Dance Companies, Huntsville
- Data Communications Service, Equipment, Supplies & Sales, Huntsville
- Day Spas, Huntsville
- Debt Management Assistance & Services, Huntsville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Huntsville
- Decorating & Designing Services, Huntsville
- Demolition Work, Huntsville
- Dental Clinics, Huntsville
- Dentists, Huntsville
- Denturists, Huntsville
- Department Stores, Huntsville
- Diabetes Centers, Huntsville
- Diaper Products, Huntsville
- Diesel, Huntsville - Engine Fuels, Oils & Lubricants
- Direct Mail Advertising Services, Huntsville
- Dirt, Huntsville
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- Disc Jockeys, Huntsville
- Discount Stores, Huntsville - Clothing, Grocery, Furniture, Etc
- Dock Construction - Build & Repair, Huntsville - Dock Builders
- Doctors, Physicians & Surgeons, Huntsville
- Dodge Dealers, Huntsville
- Dog Breeders, Huntsville
- Donuts, Huntsville
- Door & Gate Operating Devices, Huntsville
- Doors & Door Frames, Huntsville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Huntsville
- Drainage Contractors, Huntsville - Install & Repair Drainage Systems
- Drinking Establishments, Huntsville
- Dry Cleaning & Laundry, Huntsville - Dry Cleaners
- Dryers Sales, Service & Repair, Huntsville - Gas & Electric
- Drywall Contractors, Huntsville - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Huntsville - Installation & Repair Services
- Duct Work & Duct Supplies & Equipment, Huntsville
- Dunlop Tires, Huntsville - Dealers
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