- Dance Companies, Beltsville
- Dance Instruction Night Club, Beltsville
- Data Communications Service, Equipment, Supplies & Sales, Beltsville
- Data Processing Services, Beltsville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Beltsville
- Decorating & Designing Services, Beltsville
- Dehumidifying & Ventilating Equipment, Beltsville - Suppliers & Wholesalers
- Delicatessen Restaurants, Beltsville
- Deliverance Church, Beltsville
- Delivery & Errand Services, Beltsville
- Denomination, Non-Denominational, Etcetera, Beltsville
- Dentists, Beltsville
- Department Stores, Beltsville
- Developmental Children Services, Beltsville
- Developmental Disabilities, Beltsville
- Dialysis Clinics, Beltsville - Kidney Dialysis Centers
- Digital Printing & Imaging Service, Beltsville
- Diner Restaurants, Beltsville
- Direct Mail Advertising Services, Beltsville
- Disabled Persons Assistive Services, Beltsville
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- Discount Stores, Beltsville - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Beltsville
- Displays & Display Installation Service, Beltsville - Trade Show Displays
- Distributors, Beltsville
- Doctors, Physicians & Surgeons, Beltsville
- Door & Gate Operating Devices, Beltsville
- Door Glass & Mirrors, Beltsville
- Door Installation & Repair, Beltsville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Beltsville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drilling & Boring Equipment & Supplies, Beltsville
- Drinking Establishments, Beltsville
- Driveway, Parking Lot & Blacktop Contractors, Beltsville - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Beltsville
- Dry Cleaning & Laundry, Beltsville - Dry Cleaners
- Drywall Contractors, Beltsville - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Beltsville
- Drywall, Insulation & Plaster Contractors, Beltsville - Installation & Repair Services
- Durable & Non Durable Goods & Products, Beltsville
- Durable Goods & Products, Beltsville
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