- Dance Companies, Fairfield
- Day Spas, Fairfield
- Denomination, Non-Denominational, Etcetera, Fairfield
- Dentists, Fairfield
- Department Stores, Fairfield
- Developmental Children Services, Fairfield
- Developmental Disabilities, Fairfield
- Dialysis Clinics, Fairfield - Kidney Dialysis Centers
- Diesel Engine, Fairfield
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- Diesel Engine Repair & Service, Fairfield
- Diner Restaurants, Fairfield
- Discount Stores, Fairfield - Clothing, Grocery, Furniture, Etc
- Disease, Handicap & Disability Services, Organizations & Groups, Fairfield
- Doctors, Physicians & Surgeons, Fairfield
- Drilling & Boring Equipment & Supplies, Fairfield
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Fairfield
- Dry Cleaning & Laundry, Fairfield - Dry Cleaners
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