- Cable TV Companies & Services, Oakland
- Cafe Restaurants, Oakland
- Car Rental, Oakland - Rental Cars & Lease Service
- Carpet Rug & Upholstery Cleaners, Oakland
- Cars, Truck, Van & SUV Car Dealerships, Oakland - Auto Dealers
- Casual Dining Restaurants, Oakland
- Central American Restaurants, Oakland
- Christian Churches, Oakland
- Church Of Christ, Oakland
- Churches 1 Of 3, Oakland
- City & County Administrative Agencies, Oakland
- City & County Government, Oakland
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- Cleaning & Maintenance Services, Oakland
- Clinics, Oakland
- Clothing Stores, Oakland - Clothes & Accessories
- Communications Services, Oakland
- Community & Recreational Facilities, Oakland
- Community Services, Oakland
- Congregational Church, Oakland
- Construction, Oakland
- Construction Companies, Oakland
- Consultants & Services, Oakland
- Convenience Stores, Oakland
- Country Clubs, Oakland
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