- Cable & Wire Installation, Fairfield
- Cable TV Companies & Services, Fairfield
- Car Detailing & Wash Service, Fairfield - Auto Detailing
- Cars, Truck, Van & SUV Car Dealerships, Fairfield - Auto Dealers
- Cash Registers & Supplies, Fairfield
- Casual Dining Restaurants, Fairfield
- Caterers Food Services, Fairfield
- Catholic Churches, Fairfield
- Charitable & Non-Profit Organizations, Fairfield
- Child Care & Day Care Services, Fairfield
- Christian Literature & Supplies - Christian Book Store, Fairfield
- Church Of The Nazarene, Fairfield
- Churches 1 Of 3, Fairfield
- Churches 2 Of 3, Fairfield
- Churches Seventh Day Adventist, Fairfield
- City & County Government, Fairfield
- Clinics, Fairfield
- Colleges & Universities, Fairfield
- Communications Services, Fairfield
- Community Services, Fairfield
- Computer & Audio Visual Services, Fairfield
- Computer & Laptop Repair, Fairfield - PC Repair Services
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- Computer & Software Stores, Fairfield
- Computer Networks, Fairfield - Design & Systems
- Computer Repair, Fairfield
- Computer Stores, Fairfield
- Concrete, Fairfield - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Fairfield
- Concrete Product Manufacturers, Fairfield
- Construction, Fairfield
- Construction & Civil Engineer, Fairfield
- Construction Equipment Rental & Leasing, Fairfield
- Consultants & Services, Fairfield
- Contact Lenses, Fairfield
- Convenience Stores, Fairfield
- Copier & Copy Machine Sales, Supplies, Service & Repair, Fairfield
- Copier & Copy Machine Supplies, Equipment & Parts, Fairfield
- Copying & Duplicating Services, Fairfield
- Courier Service, Fairfield
- Crane Services, Fairfield
- Cranes Hoisting & Rigging Service, Fairfield - Crane Rental Service
- Cremation Services, Supplies & Equipment, Fairfield
- Custom Designed Replica Car Dealers, Fairfield - Auto Dealers
- Customer Service Representatives, Fairfield
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