- Dance Companies, Duncansville
- Day Spas, Duncansville
- Deck Cleaning & Restoration, Duncansville - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Duncansville
- Delicatessen Restaurants, Duncansville
- Dental Bonding & Cosmetic Dentistry, Duncansville - Cosmetic Dentist & Tooth Bonding
- Dentists, Duncansville
- Department Stores, Duncansville
- Developmental Disabilities, Duncansville
- Diabetic Equipment & Supplies, Duncansville
- Diabetic Equipment Supplies & Services, Duncansville
- Diesel Engine, Duncansville
- Diesel Engine Repair & Service, Duncansville
- Digital Imaging Photographers, Duncansville
- Direct Mail Advertising, Duncansville
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- Direct Mail Advertising Services, Duncansville
- Disability And Social Security Attorneys & Lawyers, Duncansville
- Disabled Persons Assistive Services, Duncansville
- Disc Jockeys, Duncansville
- Discount Stores, Duncansville - Clothing, Grocery, Furniture, Etc
- Diving Instruction, Duncansville
- Doctors, Physicians & Surgeons, Duncansville
- Doors & Door Frames, Duncansville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drive In Restaurants, Duncansville
- Driveway, Parking Lot & Blacktop Contractors, Duncansville - Construction, Repair & Maintenance
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Duncansville
- Dry Cleaning & Laundry, Duncansville - Dry Cleaners
- Drywall Contractors, Duncansville - Drywall Repair & Installation Services
- Durable & Non Durable Goods & Products, Duncansville
- Durable Goods & Products, Duncansville
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