- Dance Companies, Billerica
- Data Processing Services, Billerica
- Data Recovery Services, Billerica - Hard Drive Data Recovery, etc
- Day Spas, Billerica
- Defense Contractors, Billerica
- Delicatessen Restaurants, Billerica
- Dentists, Billerica
- Department Stores, Billerica
- Developmental Disabilities, Billerica
- Digital Imaging Photographers, Billerica
- Digital Printing & Imaging Service, Billerica
- Dimension Stone Products, Billerica
- Direct Mail Advertising Services, Billerica
- Disabled Persons Assistive Services, Billerica
- Disc Jockeys, Billerica
- Discount Stores, Billerica - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Billerica
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- Dispensing Machines, Billerica
- Dock Construction - Build & Repair, Billerica - Dock Builders
- Doctors, Physicians & Surgeons, Billerica
- Doll Houses, Billerica
- Dolls, Doll Houses & Accessories , Billerica
- Donuts, Billerica
- Drafting Services, Billerica
- Drinking Establishments, Billerica
- Drugs & Pharmaceutical Supplies, Billerica
- Dry Cleaning & Laundry, Billerica - Dry Cleaners
- Drywall Contractors, Billerica - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Billerica - Installation & Repair Services
- Dump Truck, Billerica
- Dumpster Rental, Billerica
- Durable & Non Durable Goods & Products, Billerica
- Durable Goods & Products, Billerica
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