- Dance Companies, Northborough
- Data Communications Service, Equipment, Supplies & Sales, Northborough
- Data Processing Equipment Sales Service & Maintenance, Northborough
- Data Processing Services, Northborough
- Day Spas, Northborough
- Decorating & Designing Services, Northborough
- Delicatessen Restaurants, Northborough
- Delivery & Errand Services, Northborough
- Dental Bonding & Cosmetic Dentistry, Northborough - Cosmetic Dentist & Tooth Bonding
- Dentists, Northborough
- Department Stores, Northborough
- Developmental Children Services, Northborough
- Developmental Disabilities, Northborough
- Diner Restaurants, Northborough
- Direct Mail Advertising Services, Northborough
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- Divorce & Family Law Attorneys & Lawyers, Northborough
- Doctors, Physicians & Surgeons, Northborough
- Donuts, Northborough
- Door & Gate Operating Devices, Northborough
- Doors & Door Frames, Northborough - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drainage Contractors, Northborough - Install & Repair Drainage Systems
- Drinking Establishments, Northborough
- Driveway Contractors - Build, Repair, Sealing, Northborough - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Northborough
- Dry Cleaning & Laundry, Northborough - Dry Cleaners
- Dryers Sales, Service & Repair, Northborough - Gas & Electric
- Drywall, Insulation & Plaster Contractors, Northborough - Installation & Repair Services
- Durable & Non Durable Goods & Products, Northborough
- Durable Goods & Products, Northborough
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