- Cable TV Companies & Services, Portland
- Cafe Restaurants, Portland
- Campers & Pick-Up Canopies Parts & Supplies, Portland
- Campgrounds, Portland
- Candy, Nut & Confectionery Wholesale & Retail, Portland - Candy Stores
- Car Detailing & Wash Service, Portland - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Portland
- Carnivals, Fairs & Exhibitions, Portland
- Carpet Rug & Upholstery Cleaners, Portland
- Carpet, Rug & Linoleum Flooring Dealers, Portland
- Cars, Truck, Van & SUV Car Dealerships, Portland - Auto Dealers
- Casual Dining Restaurants, Portland
- Catalog, Mail-Order & Electronic Shopping, Portland
- Caterers Food Services, Portland
- Catholic Churches, Portland
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Portland
- Cellular & Mobile Phone Service, Portland
- Central American Restaurants, Portland
- Chambers Of Commerce, Portland
- Charitable & Non-Profit Organizations, Portland
- Check Cashing Services, Portland
- Chemical Product Manufacturers, Portland
- Chicken Restaurants, Portland
- Child Care & Day Care Services, Portland
- Child Related Social Services, Portland
- Chinese Restaurants, Portland
- Chiropractor, Portland
- Christian Churches, Portland
- Church Of Christ, Portland
- Church Of The Nazarene, Portland
- Churches 1 Of 3, Portland
- Churches 2 Of 3, Portland
- City & County Administrative Agencies, Portland
- City & County Correctional Facilities, Portland
- City & County Government, Portland
- Cleaning & Maintenance Services, Portland
- Clergy, Portland
- Clinics, Portland
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- Clothing & Accessories Resale & Consignment Shops, Portland
- Clutches, Portland
- Clutches & Facings, Portland
- CNC Machine Shop, Portland
- Coating Engraving & Allied Services Manufacturing, Portland
- Colleges & Universities, Portland
- Commercial & Industrial Laundry, Portland
- Commercial Equipment, Portland
- Commercial Printing Manufacturers, Portland
- Communications Services, Portland
- Community & Recreational Facilities, Portland
- Community Centers, Portland
- Community Services, Portland
- Computer & Equipment Rental & Leasing, Portland
- Computer & Laptop Repair, Portland - PC Repair Services
- Computer & Software Stores, Portland
- Computer Networks, Portland - Design & Systems
- Computer Repair, Portland
- Computer Stores, Portland
- Computer Stores - Other, Portland
- Concrete, Portland - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Portland
- Concrete Contractors, Portland - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Portland
- Condiments & Sauces, Portland
- Construction, Portland
- Construction Companies, Portland
- Construction Equipment Rental & Leasing, Portland
- Construction Services, Portland
- Consultants & Services, Portland
- Contact Lenses, Portland
- Convenience Stores, Portland
- Convention & Meeting Facilities, Portland - Meeting Rooms
- Cosmetics, Portland
- Credit Unions, Portland
- Critical & Emergency Care Doctors, Portland - Intensive Care Doctors, Physicians & Surgeons
- Crushed Stone & Rock, Portland - Crushed Granite, Concrete, Gravel, etc
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