- Cafe Restaurants, Portland
- Campgrounds, Portland
- Camping Supplies & Equipment Stores, Portland - Tents, Gear & Accessories
- Car Detailing & Wash Service, Portland - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Portland
- Carpenters, Portland - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Portland
- Cars, Truck, Van & SUV Car Dealerships, Portland - Auto Dealers
- Cash Registers & Supplies, Portland
- Casual Dining Restaurants, Portland
- Caterers Food Services, Portland
- Catholic Churches, Portland
- Child Care & Day Care Services, Portland
- Child Related Social Services, Portland
- Chinese Restaurants, Portland
- Churches 1 Of 3, Portland
- Churches 2 Of 3, Portland
- Churches Seventh Day Adventist, Portland
- City & County Government, Portland
- Cleaning & Maintenance Services, Portland
- Cleaning Solvents, Portland - Cleaning Compounds
- Cleaning Supplies & Products, Portland
- Clinics, Portland
- CNC Machine Shop, Portland
- Coffee, Portland
- Coffee, Espresso & Tea House Restaurants, Portland
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- Coin Dealers & Supplies , Portland
- Commercial Printing Manufacturers, Portland
- Community & Recreational Facilities, Portland
- Community Centers, Portland
- Community Services, Portland
- Computer & Laptop Repair, Portland - PC Repair Services
- Computer Repair, Portland
- Computer Services, Portland
- Computer Support & Help Services, Portland
- Computer Technical Assistance & Support Services, Portland - Tech Support Service
- Concrete, Portland - Cement & Concrete Products, Suppliers, Companies
- Concrete Contractors, Portland - Concrete Construction & Concrete Companies
- Concrete Handling Services, Portland - Concrete Pumping
- Congregational Church, Portland
- Construction, Portland
- Construction Companies, Portland
- Consultants & Services, Portland
- Convalescent Homes Placement Services, Portland - Convalescent Care
- Convenience Stores, Portland
- Counseling Services, Portland
- Credit Card & Plans - Machines, Equipment & Supplies , Portland - Terminal Systems
- Credit Card Merchant Services, Portland
- Credit Card Plan Services, Portland
- Criminal Attorneys & Lawyers, Portland
- Criminal Defense Attorneys & Lawyers, Portland
- Criminal Defense Lawyers & Attorneys, Portland
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