- Dairy Farm Equipment, Frederick
- Dairy Products - Wholesale & Retail, Frederick
- Dance Companies, Frederick
- Data Communications Service, Equipment, Supplies & Sales, Frederick
- Data Processing Services, Frederick
- Day Spas, Frederick
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Frederick
- Decorating & Designing Services, Frederick
- Defense Consulting Agencies, Frederick
- Defense Contractors, Frederick
- Dehumidifying & Ventilating Equipment, Frederick - Suppliers & Wholesalers
- Delicatessen Grocers, Frederick
- Delicatessen Restaurants, Frederick
- Delivery & Errand Services, Frederick
- Denomination, Non-Denominational, Etcetera, Frederick
- Dental Bonding & Cosmetic Dentistry, Frederick - Cosmetic Dentist & Tooth Bonding
- Dentists, Frederick
- Deodorant, Disinfectants & Germicides, Frederick
- Department Stores, Frederick
- Dermatologists, Frederick - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Frederick
- Designers, Frederick
- Desktop Publishing, Frederick
- Developmental Children Services, Frederick
- Developmental Disabilities, Frederick
- Developmentally Disabled Information & Services, Frederick
- Diabetes Doctors, Frederick - Endocrinologists Physicians & Surgeons
- Diabetic Equipment & Supplies, Frederick
- Diabetic Equipment Supplies & Services, Frederick
- Dialysis Clinics, Frederick - Kidney Dialysis Centers
- Digital Imaging Photographers, Frederick
- Digital Printing & Imaging Service, Frederick
- Diner Restaurants, Frederick
- Direct Mail Advertising, Frederick
- Direct Mail Advertising Services, Frederick
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- Direct Selling Businesses, Frederick
- Dirt, Frederick
- Disabled Persons Assistive Services, Frederick
- Discount Stores, Frederick - Clothing, Grocery, Furniture, Etc
- Dishwashers Sales, Service & Repair, Frederick
- Diving Instruction, Frederick
- Divorce & Family Law Attorneys & Lawyers, Frederick
- Doctorate Degree, Frederick
- Doctors, Physicians & Surgeons, Frederick
- Document Imaging & Management, Frederick
- Donuts, Frederick
- Door & Gate Operating Devices, Frederick
- Door Glass & Mirrors, Frederick
- Door Installation & Repair, Frederick - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Frederick - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Frederick
- Drapery Blinds & Shades Installation & Repair, Frederick
- Drilling & Boring Equipment & Supplies, Frederick
- Drinking Establishments, Frederick
- Driveway, Parking Lot & Blacktop Contractors, Frederick - Construction, Repair & Maintenance
- Drugs & Pharmaceutical Supplies, Frederick
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Frederick
- Dry Cleaning & Laundry, Frederick - Dry Cleaners
- Dryer Vent Cleaning, Repair & Installation, Frederick
- Dryers Sales, Service & Repair, Frederick - Gas & Electric
- Drywall Contractors, Frederick - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Frederick
- Drywall, Insulation & Plaster Contractors, Frederick - Installation & Repair Services
- DUI Attorneys & Lawyers, Frederick - DWI - Drunk Driving
- DUI Attorneys & Lawyers, Frederick - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Frederick - DWI - Drunk Driving
- Dumpster Rental, Frederick
- Durable & Non Durable Goods & Products, Frederick
- Durable Goods & Products, Frederick
- Dwelling Operators Except Apartment, Frederick
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