- Dance Companies, Catonsville
- Data Processing Services, Catonsville
- Day Spas, Catonsville
- Deck Cleaning & Restoration, Catonsville - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Catonsville
- Decorating & Designing Services, Catonsville
- Dehumidifying & Ventilating Equipment, Catonsville - Suppliers & Wholesalers
- Delicatessen Restaurants, Catonsville
- Delivery & Errand Services, Catonsville
- Denomination, Non-Denominational, Etcetera, Catonsville
- Dental Bonding & Cosmetic Dentistry, Catonsville - Cosmetic Dentist & Tooth Bonding
- Dentists, Catonsville
- Department Stores, Catonsville
- Designers, Catonsville
- Developmental Children Services, Catonsville
- Developmental Disabilities, Catonsville
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- Dieticians & Diet Counseling, Catonsville
- Diner Restaurants, Catonsville
- Direct Mail Advertising Services, Catonsville
- Disabled Persons Assistive Services, Catonsville
- Discount Stores, Catonsville - Clothing, Grocery, Furniture, Etc
- Divorce & Family Law Attorneys & Lawyers, Catonsville
- Doctorate Degree, Catonsville
- Doctors, Physicians & Surgeons, Catonsville
- Donuts, Catonsville
- Door & Gate Operating Devices, Catonsville
- Doors & Door Frames, Catonsville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Catonsville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Catonsville
- Dry Cleaning & Laundry, Catonsville - Dry Cleaners
- Dryers Sales, Service & Repair, Catonsville - Gas & Electric
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