- Dairy Farm Equipment, Fairfield
- Dairy Products - Wholesale & Retail, Fairfield
- Dance Companies, Fairfield
- Data Communications Service, Equipment, Supplies & Sales, Fairfield
- Data Processing Services, Fairfield
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Fairfield
- Decorating & Designing Services, Fairfield
- Delicatessen Restaurants, Fairfield
- Delivery & Errand Services, Fairfield
- Dental Hygienists, Fairfield
- Dental Supplies & Equipment, Fairfield
- Dentists, Fairfield
- Department Stores, Fairfield
- Developmental Disabilities, Fairfield
- Digital Printing & Imaging Service, Fairfield
- Diner Restaurants, Fairfield
- Direct Mail Advertising, Fairfield
- Direct Mail Advertising Services, Fairfield
- Direct Selling Businesses, Fairfield
- Disc Jockeys, Fairfield
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- Discount Stores, Fairfield - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Fairfield
- Displays & Display Installation Service, Fairfield - Trade Show Displays
- Distilled Water - Wholesale, Fairfield
- Doctorate Degree, Fairfield
- Doctors, Physicians & Surgeons, Fairfield
- Document Imaging & Management, Fairfield
- Donuts, Fairfield
- Door & Gate Operating Devices, Fairfield
- Door Glass & Mirrors, Fairfield
- Doors & Door Frames, Fairfield - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drinking Establishments, Fairfield
- Driveway Contractors - Build, Repair, Sealing, Fairfield - Driveway Pavers - Concrete, Asphalt, Gravel Paving, etc
- Drugs & Pharmaceutical Supplies, Fairfield
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Fairfield
- Dry Cleaning & Laundry, Fairfield - Dry Cleaners
- Drywall Contractors, Fairfield - Drywall Repair & Installation Services
- Drywall, Insulation & Plaster Contractors, Fairfield - Installation & Repair Services
- Durable & Non Durable Goods & Products, Fairfield
- Durable Goods & Products, Fairfield
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