- Cabinets & Cabinet Hardware, Eureka
- Cabinets Refacing, Refinishing & Building, Eureka - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cabins Cottages & Chalet Rental, Eureka
- Cable TV Companies & Services, Eureka
- Cafe Restaurants, Eureka
- Campgrounds, Eureka
- Candy, Nut & Confectionery Wholesale & Retail, Eureka - Candy Stores
- Carpenters, Eureka - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Eureka
- Carpet, Rug & Linoleum Flooring Dealers, Eureka
- Casinos, Eureka
- Casual Dining Restaurants, Eureka
- Caterers Food Services, Eureka
- Catholic Churches, Eureka
- Central American Restaurants, Eureka
- Chambers Of Commerce, Eureka
- Chemical Product Manufacturers, Eureka
- Child Care & Day Care Services, Eureka
- Chiropractor, Eureka
- Christian Churches, Eureka
- Church Of God, Eureka
- Church Of Jesus Christ Of Latter Day Saints, Eureka
- Churches 1 Of 3, Eureka
- Churches 2 Of 3, Eureka
- Churches 3 Of 3, Eureka
- Churches Seventh Day Adventist, Eureka
- City & County Administrative Agencies, Eureka
- City & County Government, Eureka
- City & County Law Enforcement, Eureka
- Civil Attorneys & Lawyers, Eureka
- Civil Rights Attorneys & Lawyers, Eureka
- Civil Rights Lawyers & Attorneys, Eureka
- Cleaning & Maintenance Services, Eureka
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- Clinics, Eureka
- Clothing & Accessories Resale & Consignment Shops, Eureka
- Clothing Stores, Eureka - Clothes & Accessories
- CNC Machine Shop, Eureka
- Coating Engraving & Allied Services Manufacturing, Eureka
- Coffee, Espresso & Tea House Restaurants, Eureka
- Coin Dealers & Supplies , Eureka
- Commercial & Industrial Photographers, Eureka
- Commercial Printing, Eureka
- Commercial Printing Manufacturers, Eureka
- Communications Services, Eureka
- Community & Recreational Facilities, Eureka
- Community Services, Eureka
- Computer & Laptop Repair, Eureka - PC Repair Services
- Computer Repair, Eureka
- Computer Services, Eureka
- Concrete, Eureka - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Eureka
- Concrete Product Manufacturers, Eureka
- Construction, Eureka
- Construction Companies, Eureka
- Construction Equipment Rental & Leasing, Eureka
- Consultants & Services, Eureka
- Contractor Equipment & Supplies, Eureka - Construction Equipment & Machinery
- Convenience Stores, Eureka
- Copying & Duplicating Services, Eureka
- Cosmetics, Eureka
- County Police, Eureka
- Courier Service, Eureka
- Crane Services, Eureka
- Cranes Hoisting & Rigging Service, Eureka - Crane Rental Service
- Credit Unions, Eureka
- Custom Parts & Accessories, Eureka
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