- Dairy Farms, Sykesville
- Dairy Products - Wholesale & Retail, Sykesville
- Dance Companies, Sykesville
- Data Processing Equipment & Supplies , Sykesville
- Data Processing Services, Sykesville
- Day Spas, Sykesville
- Decals, Sykesville
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Sykesville
- Decorating & Designing Services, Sykesville
- Delicatessen Restaurants, Sykesville
- Dental Bonding & Cosmetic Dentistry, Sykesville - Cosmetic Dentist & Tooth Bonding
- Dental Hygienists, Sykesville
- Dentists, Sykesville
- Department Stores, Sykesville
- Developmental Children Services, Sykesville
- Developmental Disabilities, Sykesville
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- Digital Imaging Photographers, Sykesville
- Dirt, Sykesville
- Discount Stores, Sykesville - Clothing, Grocery, Furniture, Etc
- Diving Instruction, Sykesville
- Doctorate Degree, Sykesville
- Doctors, Physicians & Surgeons, Sykesville
- Door & Gate Operating Devices, Sykesville
- Doors & Door Frames, Sykesville - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Sykesville
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Sykesville
- Dry Cleaning & Laundry, Sykesville - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Sykesville - Installation & Repair Services
- DUI Attorneys & Lawyers, Sykesville - DWI - Drunk Driving
- DUI Attorneys & Lawyers, Sykesville - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Sykesville - DWI - Drunk Driving
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