- Dairy Farms, Hyattsville
- Dairy Products - Wholesale & Retail, Hyattsville
- Dance Companies, Hyattsville
- Data Processing Services, Hyattsville
- Day Spas, Hyattsville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Hyattsville
- Decorating & Designing Services, Hyattsville
- Delicatessen Restaurants, Hyattsville
- Delivery & Errand Services, Hyattsville
- Denomination, Non-Denominational, Etcetera, Hyattsville
- Dental Bonding & Cosmetic Dentistry, Hyattsville - Cosmetic Dentist & Tooth Bonding
- Dental Hygienists, Hyattsville
- Dentists, Hyattsville
- Department Stores, Hyattsville
- Dermatologists, Hyattsville - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Hyattsville
- Designers, Hyattsville
- Developmental Disabilities, Hyattsville
- Diabetes Doctors, Hyattsville - Endocrinologists Physicians & Surgeons
- Dialysis Clinics, Hyattsville - Kidney Dialysis Centers
- Diamonds & Precious & Semi-Precious Stones, Hyattsville
- Die Cutting Machine, Supplies & Equipment, Hyattsville
- Dies, Hyattsville
- Diesel Engine, Hyattsville
- Digital Imaging Photographers, Hyattsville
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- Digital Video Disc (Dvd) Duplication, Hyattsville
- Digital Video Disc (Dvd) Production, Hyattsville
- Direct Mail Advertising, Hyattsville
- Direct Mail Advertising Services, Hyattsville
- Direct Selling Businesses, Hyattsville
- Disability And Social Security Attorneys & Lawyers, Hyattsville
- Disc Jockeys, Hyattsville
- Disciples Of Christ Church, Hyattsville
- Discount Stores, Hyattsville - Clothing, Grocery, Furniture, Etc
- Doctors, Physicians & Surgeons, Hyattsville
- Donuts, Hyattsville
- Door & Gate Operating Devices, Hyattsville
- Door Installation & Repair, Hyattsville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Drafting Services, Hyattsville
- Dressmakers Supplies, Hyattsville
- Drinking Establishments, Hyattsville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Hyattsville
- Dry Cleaning & Laundry, Hyattsville - Dry Cleaners
- Drywall Contractors, Hyattsville - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Hyattsville
- Drywall, Insulation & Plaster Contractors, Hyattsville - Installation & Repair Services
- Duct Work & Duct Supplies & Equipment, Hyattsville
- Dumpster Rental, Hyattsville
- Durable & Non Durable Goods & Products, Hyattsville
- Dwelling Operators Except Apartment, Hyattsville
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