- Cabins Cottages & Chalet Rental, Martinez
- Car Rental, Martinez - Rental Cars & Lease Service
- Car Tune Up Service, Martinez - Auto Tune Up
- Carpet Manufacturers & Finishers, Martinez
- Carpet & Rug Materials, Martinez
- Carpet Installation & Cleaning - Commercial & Industrial, Martinez - Rug Cleaners
- Cars, Truck, Van & SUV Car Dealerships, Martinez - Auto Dealers
- Casual Dining Restaurants, Martinez
- Child Care & Day Care Services, Martinez
- Childrens After School Programs, Martinez
- Communications Services, Martinez
- Community Services, Martinez
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- Computer Services, Martinez
- Construction, Martinez
- Construction Equipment & Supplies, Martinez
- Construction Services, Martinez
- Consultants & Services, Martinez
- Copier & Copy Machine Sales, Supplies, Service & Repair, Martinez
- Copier & Copy Machine Supplies, Equipment & Parts, Martinez
- Copying & Duplicating Services, Martinez
- Cosmetology School, Martinez
- Counseling Services, Martinez
- Credit Card Merchant Services, Martinez
- Credit Card Plan Services, Martinez
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