- Dance Companies, Royal Oak
- Data Processing Services, Royal Oak
- Day Spas, Royal Oak
- Debt Adjusters, Royal Oak
- Debt Consolidation, Royal Oak
- Debt Management Assistance & Services, Royal Oak
- Decorating & Designing Services, Royal Oak
- Dehumidifying & Ventilating Equipment, Royal Oak - Suppliers & Wholesalers
- Delicatessen Restaurants, Royal Oak
- Delivery & Errand Services, Royal Oak
- Dental Bonding & Cosmetic Dentistry, Royal Oak - Cosmetic Dentist & Tooth Bonding
- Dentists, Royal Oak
- Department Stores, Royal Oak
- Dermatologists, Royal Oak - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designers, Royal Oak
- Developmental Disabilities, Royal Oak
- Dialysis Clinics, Royal Oak - Kidney Dialysis Centers
- Digital Printing & Imaging Service, Royal Oak
- Diner Restaurants, Royal Oak
- Direct Mail Advertising Services, Royal Oak
- Direct Marketing, Royal Oak
- Disabled Persons Assistive Services, Royal Oak
- Discount Stores, Royal Oak - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Royal Oak
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- Diving Equipment & Supplies, Royal Oak - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, Royal Oak
- Divorce & Family Law Attorneys & Lawyers, Royal Oak
- Doctorate Degree, Royal Oak
- Doctors, Physicians & Surgeons, Royal Oak
- Doll Houses, Royal Oak
- Dolls, Doll Houses & Accessories , Royal Oak
- Donuts, Royal Oak
- Door & Gate Operating Devices, Royal Oak
- Door Glass & Mirrors, Royal Oak
- Door Installation & Repair, Royal Oak - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Royal Oak - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Royal Oak
- Dressmakers Supplies, Royal Oak
- Drinking Establishments, Royal Oak
- Drug Screening Services, Royal Oak
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Royal Oak
- Dry Cleaning & Laundry, Royal Oak - Dry Cleaners
- Drywall Contractors, Royal Oak - Drywall Repair & Installation Services
- Dumpster Rental, Royal Oak
- Durable & Non Durable Goods & Products, Royal Oak
- Durable Goods & Products, Royal Oak
- Dwelling Operators Except Apartment, Royal Oak
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