- Dance Companies, Somerville
- Data Communications Service, Equipment, Supplies & Sales, Somerville
- Day Spas, Somerville
- Decals, Somerville
- Decorating & Designing Services, Somerville
- Delicatessen Restaurants, Somerville
- Delivery & Errand Services, Somerville
- Dental Bonding & Cosmetic Dentistry, Somerville - Cosmetic Dentist & Tooth Bonding
- Dentists, Somerville
- Department Stores, Somerville
- Dermatologists, Somerville - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Disabilities, Somerville
- Diabetes Centers, Somerville
- Diesel Engine, Somerville
- Dieticians & Diet Counseling, Somerville
- Digital Printing & Imaging Service, Somerville
- Diner Restaurants, Somerville
- Direct Magazine Sales & Delivery, Somerville
- Direct Mail Advertising, Somerville
- Direct Mail Advertising Services, Somerville
- Direct Selling Businesses, Somerville
- Disabled Persons Assistive Services, Somerville
- Disc Jockeys, Somerville
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- Discount Stores, Somerville - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Somerville
- Displays & Display Installation Service, Somerville - Trade Show Displays
- Divorce & Family Law Attorneys & Lawyers, Somerville
- Doctorate Degree, Somerville
- Doctors, Physicians & Surgeons, Somerville
- Donuts, Somerville
- Door & Gate Operating Devices, Somerville
- Door Glass & Mirrors, Somerville
- Doors & Door Frames, Somerville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drainage Contractors, Somerville - Install & Repair Drainage Systems
- Drapery Hardware & Blinds & Shades Manufacturers, Somerville
- Drinking Establishments, Somerville
- Driveway Contractors - Build, Repair, Sealing, Somerville - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Drugs & Pharmaceutical Supplies, Somerville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Somerville
- Dry Cleaning & Laundry, Somerville - Dry Cleaners
- Drywall Contractors, Somerville - Drywall Repair & Installation Services
- Dump Truck, Somerville
- Dumpster Rental, Somerville
- Durable & Non Durable Goods & Products, Somerville
- Durable Goods & Products, Somerville
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