- Cable TV Companies & Services, Washington
- Cafe Restaurants, Washington
- Cancer Educational, Referral & Support Service Centers, Washington
- Cancer Treatment & Information Services , Washington
- Casual Dining Restaurants, Washington
- Catholic Churches, Washington
- Churches 1 Of 3, Washington
- City & County Administrative Agencies, Washington
- City & County Government, Washington
- City & County Law Enforcement, Washington
- Colleges & Universities, Washington
- Communications Services, Washington
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- Community Services, Washington
- Computer & Audio Visual Services, Washington
- Computer & Laptop Repair, Washington - PC Repair Services
- Computer Repair, Washington
- Computer Software Publishers & Developers, Washington
- Computers Disaster Planning Services, Washington
- Concrete Contractors, Washington - Concrete Construction & Concrete Companies
- Construction, Washington
- Construction Services, Washington
- Consultants & Services, Washington
- Country Cooking Restaurants, Washington
- Credit Unions, Washington
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