- Dance Companies, Millersville
- Data Communications Service, Equipment, Supplies & Sales, Millersville
- Day Spas, Millersville
- Deck Cleaning & Restoration, Millersville - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Millersville
- Decorating & Designing Services, Millersville
- Delicatessen Restaurants, Millersville
- Delivery & Errand Services, Millersville
- Denomination, Non-Denominational, Etcetera, Millersville
- Dentists, Millersville
- Deodorant, Disinfectants & Germicides, Millersville
- Deodorizing & Disinfecting Services, Millersville
- Desktop Publishing, Millersville
- Developmental Disabilities, Millersville
- Digital Imaging Photographers, Millersville
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- Digital Printing & Imaging Service, Millersville
- Direct Mail Advertising Services, Millersville
- Discount Stores, Millersville - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Millersville
- Dishwashers Sales, Service & Repair, Millersville
- Doctors, Physicians & Surgeons, Millersville
- Dogs, Millersville
- Donuts, Millersville
- Door & Gate Operating Devices, Millersville
- Door Installation & Repair, Millersville - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Millersville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drains, Pipes & Sewage Materials, Millersville
- Drinking Establishments, Millersville
- Dry Cleaning & Laundry, Millersville - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Millersville - Installation & Repair Services
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