- Cabins Cottages & Chalet Rental, Sammamish
- Cafe Restaurants, Sammamish
- Campgrounds, Sammamish
- Car Tune Up Service, Sammamish - Auto Tune Up
- Carpet Rug & Upholstery Cleaners, Sammamish
- Cars, Truck, Van & SUV Car Dealerships, Sammamish - Auto Dealers
- Casual Dining Restaurants, Sammamish
- Catholic Churches, Sammamish
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Sammamish
- Cellular & Mobile Phone Service, Sammamish
- Central American Restaurants, Sammamish
- Child Care & Day Care Services, Sammamish
- Child Related Social Services, Sammamish
- Children's Clothing Stores, Sammamish - Infant, Babies & Kids Clothing
- Childrens After School Programs, Sammamish
- Chinese Restaurants, Sammamish
- Chiropractor, Sammamish
- Chocolate & Cocoa, Sammamish
- Christian Churches, Sammamish
- Christian Science Practitioners, Sammamish
- Churches 1 Of 3, Sammamish
- City & County Administrative Agencies, Sammamish
- City & County Government, Sammamish
- Cleaning & Maintenance Services, Sammamish
- Clothing Stores, Sammamish - Clothes & Accessories
- Coffee, Sammamish
- Coffee & Tea Stores, Sammamish
- Coffee, Espresso & Tea House Restaurants, Sammamish
- Commercial & Industrial Laundry, Sammamish
- Commercial & Industrial Photographers, Sammamish
- Commercial Equipment, Sammamish
- Communications Services, Sammamish
- Community & Recreational Facilities, Sammamish
- Community Services, Sammamish
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- Computer & Audio Visual Services, Sammamish
- Computer & Laptop Repair, Sammamish - PC Repair Services
- Computer & Software Stores, Sammamish
- Computer Programming & Software Development Services, Sammamish
- Computer Repair, Sammamish
- Computer Services, Sammamish
- Computer Software & Services, Sammamish
- Computer Software Development, Sammamish
- Computer Software Publishers & Developers, Sammamish
- Computer Software Service, Sammamish
- Computer System Consultants, Sammamish - IT Consulting Services
- Computer System Designers & Consultants, Sammamish
- Construction, Sammamish
- Construction & Civil Engineer, Sammamish
- Construction Estimators, Sammamish
- Construction Services, Sammamish
- Consultants & Services, Sammamish
- Control Systems & Regulators, Sammamish
- Convenience Stores, Sammamish
- Convention & Meeting Facilities, Sammamish - Meeting Rooms
- Convention & Visitor Information & Bureaus, Sammamish - Tourist Information Centers
- Convention Services - Other, Sammamish
- Cosmetics, Sammamish
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Sammamish
- Country Clubs, Sammamish
- Covenant Churches, Sammamish
- Crane Services, Sammamish
- Cranes & Derricks, Sammamish
- Cranes Hoisting & Rigging Service, Sammamish - Crane Rental Service
- Credit Card Merchant Services, Sammamish
- Credit Card Plan Services, Sammamish
- Cut Stone & Stone Products Manufacturers, Sammamish
- Cyber Cafes, Sammamish
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