- Cafe Restaurants, Portland
- Carpet Rug & Upholstery Cleaners, Portland
- Carpet, Rug & Linoleum Flooring Dealers, Portland
- Casual Dining Restaurants, Portland
- Caterers Food Services, Portland
- Catholic Churches, Portland
- Check Protection Equipment & Supplies, Portland
- Check Verification Services, Portland
- Chemical & Toxic Material Research, Portland
- Chemists Professional, Portland
- Chinese Restaurants, Portland
- Chiropractor, Portland
- Church Of Jesus Christ Of Latter Day Saints, Portland
- Church Of The Nazarene, Portland
- Churches 1 Of 3, Portland
- Churches Seventh Day Adventist, Portland
- Cigar, Cigarette & Tobacco Store & Supplies, Portland
- City & County Government, Portland
- Cleaning & Maintenance Services, Portland
- Clergy, Portland
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- Clinics, Portland
- Communications Services, Portland
- Community & Recreational Facilities, Portland
- Community Services, Portland
- Computer & Audio Visual Services, Portland
- Computer & Software Stores, Portland
- Computer Repair, Portland
- Computer Software & Services, Portland
- Computer Software Service, Portland
- Concrete, Portland - Cement & Concrete Products, Suppliers, Companies
- Concrete Contractors, Portland - Concrete Construction & Concrete Companies
- Congregational Church, Portland
- Construction, Portland
- Construction Services, Portland
- Consultants & Services, Portland
- Contact Lenses, Portland
- Convenience Stores, Portland
- Convention & Meeting Facilities, Portland - Meeting Rooms
- Custom Parts & Accessories, Portland
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