- Cabins Cottages & Chalet Rental, Oakland
- Cable TV Companies & Services, Oakland
- Cafe Restaurants, Oakland
- Campgrounds, Oakland
- Car Alarms & Security Systems, Oakland - Remote Car Starter, etc
- Car Rental, Oakland - Rental Cars & Lease Service
- Carpet Rug & Upholstery Cleaners, Oakland
- Carpet, Rug & Linoleum Flooring Dealers, Oakland
- Casual Dining Restaurants, Oakland
- Caterers Food Services, Oakland
- Catholic Churches, Oakland
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Oakland
- Cellular & Mobile Phone Service, Oakland
- Ceramic Tile Flooring, Oakland
- Ceramic Tile Installation - Repair, Oakland - Ceramic Tiles Contractors
- Chemical Compounds, Oakland
- Chemical Products, Oakland - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals & Related Products, Oakland
- Child Care & Day Care Services, Oakland
- Child Day Care Information & Referral Services, Oakland
- Child Related Social Services, Oakland
- Childrens After School Programs, Oakland
- Chinese Restaurants, Oakland
- Chiropractor, Oakland
- Churches 1 Of 3, Oakland
- City & County Administrative Agencies, Oakland
- City & County Government, Oakland
- Cleaning & Maintenance Services, Oakland
- Clinics, Oakland
- Clothing Stores, Oakland - Clothes & Accessories
- Coffee, Oakland
- Coffee, Espresso & Tea House Restaurants, Oakland
- College Board Preparation, Oakland
- Commercial & Industrial Photographers, Oakland
- Commercial Equipment, Oakland
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- Commercial Printing, Oakland
- Commercial Printing Manufacturers, Oakland
- Communications Services, Oakland
- Community & Recreational Facilities, Oakland
- Community Services, Oakland
- Computer & Audio Visual Services, Oakland
- Computer & Laptop Repair, Oakland - PC Repair Services
- Computer & Software Stores, Oakland
- Computer Repair, Oakland
- Computer Software & Services, Oakland
- Computer Software Service, Oakland
- Computer System Consultants, Oakland - IT Consulting Services
- Computer System Designers & Consultants, Oakland
- Concrete Contractors, Oakland - Concrete Construction & Concrete Companies
- Concrete Grinding Equipment, Oakland - Concrete Grinder
- Concrete Repair, Restoration, Sealing & Cleaning, Oakland
- Concrete Supplies & Equipment, Oakland - Concrete Grinder, Concrete Pumping, Cement Mixer, etc
- Condiments & Sauces, Oakland
- Construction, Oakland
- Construction & Civil Engineer, Oakland
- Construction Machinery, Oakland - Mining Machinery
- Construction Services, Oakland
- Consultants & Services, Oakland
- Convenience Stores, Oakland
- Convention & Meeting Facilities, Oakland - Meeting Rooms
- Cooking, Food & Beverage Equipment, Oakland
- Cosmetics, Oakland
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Oakland
- Credit Unions, Oakland
- Cruise Agents, Oakland - Travel Agents
- Cruise Lines, Oakland - Cruises
- Cryogenic Equipment & Supplies, Oakland
- Custom Furniture, Oakland - Furniture Designers & Custom Builders
- Custom Sewing & Alterations, Oakland
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