- Dance Companies, Wallingford
- Data Processing Equipment & Supplies , Wallingford
- Data Processing Services, Wallingford
- Day Spas, Wallingford
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Wallingford
- Decorating & Designing Services, Wallingford
- Delicatessen Restaurants, Wallingford
- Delivery & Errand Services, Wallingford
- Dental Bonding & Cosmetic Dentistry, Wallingford - Cosmetic Dentist & Tooth Bonding
- Dental Supplies & Equipment, Wallingford
- Dentists, Wallingford
- Deodorizing & Disinfecting Services, Wallingford
- Department Stores, Wallingford
- Diagnostic Equipment Medical, Wallingford
- Dieticians & Diet Counseling, Wallingford
- Diner Restaurants, Wallingford
- Direct Mail Advertising, Wallingford
- Direct Mail Advertising Services, Wallingford
- Disc Jockeys, Wallingford
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- Discount Stores, Wallingford - Clothing, Grocery, Furniture, Etc
- Diving Equipment & Supplies, Wallingford - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, Wallingford
- Doctors, Physicians & Surgeons, Wallingford
- Dog & Cat Foods, Wallingford
- Donuts, Wallingford
- Door & Gate Operating Devices, Wallingford
- Door Closers & Checks, Wallingford
- Drinking Establishments, Wallingford
- Driveway Contractors - Build, Repair, Sealing, Wallingford - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Drugs & Pharmaceutical Supplies, Wallingford
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Wallingford
- Dry Cleaning & Laundry, Wallingford - Dry Cleaners
- Dryers Sales, Service & Repair, Wallingford - Gas & Electric
- Drywall Contractors, Wallingford - Drywall Repair & Installation Services
- Dumpster Rental, Wallingford
- Durable & Non Durable Goods & Products, Wallingford
- Dwelling Operators Except Apartment, Wallingford
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