- Dance Companies, Plainville
- Delicatessen Restaurants, Plainville
- Demolition Work, Plainville
- Dental Supplies & Equipment, Plainville
- Dentists, Plainville
- Department Stores, Plainville
- Diamonds & Precious & Semi-Precious Stones, Plainville
- Diner Restaurants, Plainville
- Direct Mail Advertising Services, Plainville
- Diving Instruction, Plainville
- Doctors, Physicians & Surgeons, Plainville
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- Donuts, Plainville
- Door Installation & Repair, Plainville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Plainville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drainage Contractors, Plainville - Install & Repair Drainage Systems
- Drilling & Boring Equipment & Supplies, Plainville
- Drilling Chucks, Plainville
- Drinking Establishments, Plainville
- Driveway, Parking Lot & Blacktop Contractors, Plainville - Construction, Repair & Maintenance
- Drugs & Pharmaceutical Supplies, Plainville
- Dry Cleaning & Laundry, Plainville - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Plainville - Installation & Repair Services
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