- Dairy Products - Manufacturers, San Gabriel
- Dairy Products - Wholesale & Retail, San Gabriel
- Dance Companies, San Gabriel
- Data Processing Services, San Gabriel
- Day Spas, San Gabriel
- Decorating & Designing Services, San Gabriel
- Delicatessen Restaurants, San Gabriel
- Dental Clinics, San Gabriel
- Dental Laboratories, San Gabriel
- Dentists, San Gabriel
- Department Stores, San Gabriel
- Dermatologists, San Gabriel - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Disabilities, San Gabriel
- Developmentally Disabled Information & Services, San Gabriel
- Direct Mail Advertising Services, San Gabriel
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- Direct Marketing, San Gabriel
- Disc Jockeys, San Gabriel
- Discount Stores, San Gabriel - Clothing, Grocery, Furniture, Etc
- Diving Equipment & Supplies, San Gabriel - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, San Gabriel
- Doctors, Physicians & Surgeons, San Gabriel
- Donuts, San Gabriel
- Door & Gate Operating Devices, San Gabriel
- Door Installation & Repair, San Gabriel - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Drinking Establishments, San Gabriel
- Drugs & Pharmaceutical Supplies, San Gabriel
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, San Gabriel
- Dry Cleaning & Laundry, San Gabriel - Dry Cleaners
- Durable & Non Durable Goods & Products, San Gabriel
- Durable Goods & Products, San Gabriel
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