- Dance Companies, Unionville
- Day Spas, Unionville
- Decorating & Designing Services, Unionville
- Delicatessen Restaurants, Unionville
- Dental Laboratories, Unionville
- Dentists, Unionville
- Dessert Restaurants, Unionville
- Dieticians & Diet Counseling, Unionville
- Digital Printing & Imaging Service, Unionville
- Dim Sum Restaurants, Unionville
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- Direct Magazine Sales & Delivery, Unionville
- Direct Mail Advertising, Unionville
- Direct Selling Businesses, Unionville
- Doctors, Physicians & Surgeons, Unionville
- Dressmakers Supplies, Unionville
- Drinking Establishments, Unionville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Unionville
- Dry Cleaning & Laundry, Unionville - Dry Cleaners
- Dwelling Operators Except Apartment, Unionville
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