- Dance Companies, Oakland
- Data Communications Service, Equipment, Supplies & Sales, Oakland
- Data Processing Services, Oakland
- Data Recovery Services, Oakland - Hard Drive Data Recovery, etc
- Day Spas, Oakland
- Deaf Services, Oakland
- Debt Adjusters, Oakland
- Debt Management Assistance & Services, Oakland
- Decals, Oakland
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Oakland
- Decorating & Designing Services, Oakland
- Decorative Wood Products Manufacturers, Oakland
- Dehumidifying & Ventilating Equipment, Oakland - Suppliers & Wholesalers
- Delicatessen Restaurants, Oakland
- Deliverance Church, Oakland
- Dental Bonding & Cosmetic Dentistry, Oakland - Cosmetic Dentist & Tooth Bonding
- Dental Clinics, Oakland
- Dental Consultants, Oakland
- Dental Hygienists, Oakland
- Dental Information & Referral Service, Oakland - Educational, Referral & Support Service Centers
- Dental Oral Radiologists, Oakland
- Dentists, Oakland
- Department Stores, Oakland
- Dermatologists, Oakland - Skin Doctors, Physicians & Surgeons (Dermatology)
- Designer Clothes & Accessories, Oakland
- Designers, Oakland
- Dessert Restaurants, Oakland
- Developmental Disabilities, Oakland
- Developmentally Disabled Information & Services, Oakland
- Diabetes Services & Supplies, Oakland - Educational, Referral & Support Service Centers
- Dialysis Clinics, Oakland - Kidney Dialysis Centers
- Diamonds & Precious & Semi-Precious Stones, Oakland
- Die Casting, Oakland
- Die Cutting Machine, Supplies & Equipment, Oakland
- Dies, Oakland
- Diesel, Oakland - Engine Fuels, Oils & Lubricants
- Diesel Engine, Oakland
- Diesel Engine Repair & Service, Oakland
- Dieticians & Diet Counseling, Oakland
- Digital Printing & Imaging Service, Oakland
- Dim Sum Restaurants, Oakland
- Diner Restaurants, Oakland
- Direct Mail Advertising, Oakland
- Direct Mail Advertising Services, Oakland
- Direct Marketing, Oakland
- Direct Selling Businesses, Oakland
- Dirt, Oakland
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- Disability And Social Security Attorneys & Lawyers, Oakland
- Disabled Persons Assistive Services, Oakland
- Disc Jockeys, Oakland
- Discount Stores, Oakland - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Oakland
- Dispensing Machines, Oakland
- Displays & Display Installation Service, Oakland - Trade Show Displays
- Divers & Diving Professionals, Oakland
- Diving Equipment & Supplies, Oakland - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, Oakland
- Divorce & Family Law Attorneys & Lawyers, Oakland
- Doctorate Degree, Oakland
- Doctors, Physicians & Surgeons, Oakland
- Document Imaging & Management, Oakland
- Document Preparation, Oakland
- Dog & Cat Foods, Oakland
- Dolls, Doll Houses & Accessories , Oakland
- Donations, Oakland
- Donuts, Oakland
- Door & Gate Operating Devices, Oakland
- Door Closers & Checks, Oakland
- Door Installation & Repair, Oakland - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Oakland - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Doors Fire Resistant, Oakland
- Drafting Services, Oakland
- Drainage Contractors, Oakland - Install & Repair Drainage Systems
- Drains, Pipes & Sewage Materials, Oakland
- Draperies & Curtains Manufacturers, Oakland
- Dressmakers Supplies, Oakland
- Dressmaking & Sewing Schools, Oakland
- Drinking Establishments, Oakland
- Drive In Restaurants, Oakland
- Drug Screening Services, Oakland
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Oakland
- Dry Cleaning & Laundry, Oakland - Dry Cleaners
- Dryers Sales, Service & Repair, Oakland - Gas & Electric
- Drywall Contractors, Oakland - Drywall Repair & Installation Services
- Drywall Equipment & Supplies, Oakland
- Drywall, Insulation & Plaster Contractors, Oakland - Installation & Repair Services
- DUI Attorneys & Lawyers, Oakland - DWI - Drunk Driving
- DUI Attorneys & Lawyers, Oakland - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Oakland - DWI - Drunk Driving
- Dump Truck, Oakland
- Durable & Non Durable Goods & Products, Oakland
- Durable Goods & Products, Oakland
- Dwelling Operators Except Apartment, Oakland
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