- Dairy Products - Wholesale & Retail, Newtown
- Dance Companies, Newtown
- Data Processing Services, Newtown
- Day Spas, Newtown
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Newtown
- Decorating & Designing Services, Newtown
- Delicatessen Restaurants, Newtown
- Denomination, Non-Denominational, Etcetera, Newtown
- Dental Equipment Retail & Wholesale, Newtown
- Dental Hygienists, Newtown
- Dental Service Organizations, Newtown
- Dental Supplies & Equipment, Newtown
- Dentists, Newtown
- Department Stores, Newtown
- Developmental Children Services, Newtown
- Developmental Disabilities, Newtown
- Dialysis Clinics, Newtown - Kidney Dialysis Centers
- Digital Printing & Imaging Service, Newtown
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- Direct Mail Advertising Services, Newtown
- Dirt, Newtown
- Diving Equipment & Supplies, Newtown - Scuba & Snorkel Gear & Masks Shops
- Divorce & Family Law Attorneys & Lawyers, Newtown
- Doctorate Degree, Newtown
- Doctors, Physicians & Surgeons, Newtown
- Donuts, Newtown
- Door & Gate Operating Devices, Newtown
- Door Closers & Checks, Newtown
- Drainage Contractors, Newtown - Install & Repair Drainage Systems
- Drama Schools, Newtown
- Dressmaking & Sewing Schools, Newtown
- Drinking Establishments, Newtown
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Newtown
- Dry Cleaning & Laundry, Newtown - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Newtown - Installation & Repair Services
- Durable & Non Durable Goods & Products, Newtown
- Durable Goods & Products, Newtown
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