- Dairy Consultants, Decorah
- Dairy Farm Equipment, Decorah
- Data Networking, Decorah
- Day Spas, Decorah
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Decorah
- Decorating & Designing Services, Decorah
- Delicatessen Restaurants, Decorah
- Dentists, Decorah
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- Department Stores, Decorah
- Discount Stores, Decorah - Clothing, Grocery, Furniture, Etc
- Doctors, Physicians & Surgeons, Decorah
- Drinking Establishments, Decorah
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Decorah
- Dry Cleaning & Laundry, Decorah - Dry Cleaners
- Drywall, Insulation & Plaster Contractors, Decorah - Installation & Repair Services
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