- Cabins Cottages & Chalet Rental, Oroville
- Campgrounds, Oroville
- Cancer Educational, Referral & Support Service Centers, Oroville
- Cancer Treatment & Information Services , Oroville
- Casual Dining Restaurants, Oroville
- Catholic Churches, Oroville
- Chemical Product Manufacturers, Oroville
- Child Care & Day Care Services, Oroville
- Chiropractor, Oroville
- Church Of God, Oroville
- Church Of Jesus Christ Of Latter Day Saints, Oroville
- Churches 1 Of 3, Oroville
- Churches 2 Of 3, Oroville
- Churches Seventh Day Adventist, Oroville
- Cigar, Cigarette & Tobacco Store & Supplies, Oroville
- City & County Administrative Agencies, Oroville
- City & County Government, Oroville
- Cleaning Supplies, Systems & Equipment, Oroville - Janitorial Supplies
- Clergy, Oroville
- Clinics, Oroville
- Clothing Stores, Oroville - Clothes & Accessories
- Coffee & Tea Stores, Oroville
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- Coffee, Espresso & Tea House Restaurants, Oroville
- Commercial Physical Research, Oroville
- Commercial Printing Manufacturers, Oroville
- Communications Services, Oroville
- Community Services, Oroville
- Computer & Audio Visual Services, Oroville
- Computer & Software Stores, Oroville
- Computer Repair, Oroville
- Computer Services, Oroville
- Computer Software & Services, Oroville
- Computer Software Service, Oroville
- Computer System Consultants, Oroville - IT Consulting Services
- Computer System Designers & Consultants, Oroville
- Construction, Oroville
- Construction Companies, Oroville
- Construction Equipment Rental & Leasing, Oroville
- Consultants & Services, Oroville
- Convenience Stores, Oroville
- Cosmetics & Perfumes Outlets, Oroville
- Credit Card Merchant Services, Oroville
- Credit Card Plan Services, Oroville
- Cremation Services, Supplies & Equipment, Oroville
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