- Dance Companies, Gaithersburg
- Data Communications Service, Equipment, Supplies & Sales, Gaithersburg
- Data Processing Services, Gaithersburg
- Day Spas, Gaithersburg
- Deck Cleaning & Restoration, Gaithersburg - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Gaithersburg
- Decorating & Designing Services, Gaithersburg
- Decorative Wood Products Manufacturers, Gaithersburg
- Dehumidifying & Ventilating Equipment, Gaithersburg - Suppliers & Wholesalers
- Delicatessen Grocers, Gaithersburg
- Delicatessen Restaurants, Gaithersburg
- Delivery & Errand Services, Gaithersburg
- Denomination, Non-Denominational, Etcetera, Gaithersburg
- Dental Bonding & Cosmetic Dentistry, Gaithersburg - Cosmetic Dentist & Tooth Bonding
- Dental Hygienists, Gaithersburg
- Dental Information & Referral Service, Gaithersburg - Educational, Referral & Support Service Centers
- Dental Service Organizations, Gaithersburg
- Dental Supplies & Equipment, Gaithersburg
- Dentists, Gaithersburg
- Deodorant, Disinfectants & Germicides, Gaithersburg
- Department Stores, Gaithersburg
- Dermatologists, Gaithersburg - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Gaithersburg
- Designers, Gaithersburg
- Developmental Children Services, Gaithersburg
- Developmental Disabilities, Gaithersburg
- Diamonds & Precious & Semi-Precious Stones, Gaithersburg
- Digital Printing & Imaging Service, Gaithersburg
- Diner Restaurants, Gaithersburg
- Direct Mail Advertising, Gaithersburg
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- Direct Mail Advertising Services, Gaithersburg
- Disabled Persons Assistive Services, Gaithersburg
- Disc Jockeys, Gaithersburg
- Discount Stores, Gaithersburg - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Gaithersburg
- Divorce & Family Law Attorneys & Lawyers, Gaithersburg
- Doctorate Degree, Gaithersburg
- Doctors, Physicians & Surgeons, Gaithersburg
- Document Imaging & Management, Gaithersburg
- Donuts, Gaithersburg
- Door & Gate Operating Devices, Gaithersburg
- Doors & Door Frames, Gaithersburg - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drains, Pipes & Sewage Materials, Gaithersburg
- Drama Schools, Gaithersburg
- Draperies & Curtain Fabric Stores, Gaithersburg
- Dressmakers Supplies, Gaithersburg
- Drinking Establishments, Gaithersburg
- Driving Proficiency Testing, Gaithersburg
- Drug Screening Services, Gaithersburg
- Drugs & Pharmaceutical Supplies, Gaithersburg
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Gaithersburg
- Dry Cleaning & Laundry, Gaithersburg - Dry Cleaners
- Drywall Contractors, Gaithersburg - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Gaithersburg
- Drywall, Insulation & Plaster Contractors, Gaithersburg - Installation & Repair Services
- Dump Truck, Gaithersburg
- Durable & Non Durable Goods & Products, Gaithersburg
- Durable Goods & Products, Gaithersburg
- Dwelling Operators Except Apartment, Gaithersburg
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