- Cafe Restaurants, Mercer Island
- Campgrounds, Mercer Island
- Candy, Nut & Confectionery Wholesale & Retail, Mercer Island - Candy Stores
- Car Detailing & Wash Service, Mercer Island - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Mercer Island
- Casual Dining Restaurants, Mercer Island
- Catholic Churches, Mercer Island
- Central American Restaurants, Mercer Island
- Chambers Of Commerce, Mercer Island
- Chemical Compounds, Mercer Island
- Chemicals & Related Products, Mercer Island
- Child Care & Day Care Services, Mercer Island
- Child Related Social Services, Mercer Island
- Children & Family Entertainment, Mercer Island
- Childrens After School Programs, Mercer Island
- Chinese Restaurants, Mercer Island
- Chiropractor, Mercer Island
- Christian Churches, Mercer Island
- Church Of Christ, Mercer Island
- Church Of Jesus Christ Of Latter Day Saints, Mercer Island
- Churches 1 Of 3, Mercer Island
- City & County Administrative Agencies, Mercer Island
- City & County Government, Mercer Island
- Cleaning & Maintenance Services, Mercer Island
- Clinics, Mercer Island
- Coffee & Tea Stores, Mercer Island
- Coffee Roasting & Handling Equipment, Mercer Island
- Coffee, Espresso & Tea House Restaurants, Mercer Island
- Coin Dealers & Supplies , Mercer Island
- Collection Agency Services, Mercer Island
- Commercial Equipment, Mercer Island
- Commercial Printing, Mercer Island
- Commercial Printing Manufacturers, Mercer Island
- Commercial, Industrial & Office Space for Rent & Lease, Mercer Island
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- Communications Consultants, Mercer Island
- Communications Contractors, Mercer Island
- Communications Services, Mercer Island
- Community & Recreational Facilities, Mercer Island
- Community Centers, Mercer Island
- Community Services, Mercer Island
- Computer & Audio Visual Services, Mercer Island
- Computer & Laptop Repair, Mercer Island - PC Repair Services
- Computer & Software Stores, Mercer Island
- Computer Repair, Mercer Island
- Computer Software & Services, Mercer Island
- Computer Software & Services Business, Mercer Island
- Computer Software Service, Mercer Island
- Computer Stores, Mercer Island
- Computer System Consultants, Mercer Island - IT Consulting Services
- Computer System Designer & Consultant, Mercer Island
- Condominiums & Townhomes for Rent, Mercer Island - Townhouses & Condos for Rent & Lease
- Construction, Mercer Island
- Construction Services, Mercer Island
- Consulates & Embassies, Mercer Island
- Consultants & Services, Mercer Island
- Contractors Supplies & Equipment, Mercer Island
- Convalescent Homes Placement Services, Mercer Island - Convalescent Care
- Convenience Stores, Mercer Island
- Convention & Visitor Information & Bureaus, Mercer Island - Tourist Information Centers
- Convention Services - Other, Mercer Island
- Country Clubs, Mercer Island
- Covenant Churches, Mercer Island
- Credit Card Merchant Services, Mercer Island
- Credit Card Plan Services, Mercer Island
- Credit Reporting Agencies, Mercer Island
- Custom Home Builders, Mercer Island - Custom Homes
- Custom Sewing & Alterations, Mercer Island
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