- Cabins Cottages & Chalet Rental, Eureka
- Cable Contractors Except Communications, Eureka
- Camper, Rvs & Travel Trailer Dealers, Eureka
- Campgrounds, Eureka
- Candy Manufacturers, Eureka
- Candy, Nut & Confectionery Wholesale & Retail, Eureka - Candy Stores
- Carpet & Rug Cleaners Water Extraction & Restoration, Eureka
- Carpet Rug & Upholstery Cleaners, Eureka
- Cars, Truck, Van & SUV Car Dealerships, Eureka - Auto Dealers
- Casual Dining Restaurants, Eureka
- Caterers Food Services, Eureka
- Catholic Churches, Eureka
- Chemical Products, Eureka - Chemical Distributors, Dealers, Wholesale, etc
- Chiropractor, Eureka
- Christian Churches, Eureka
- Christian Ministries, Eureka
- Church Of Christ, Eureka
- Churches 1 Of 3, Eureka
- Churches 2 Of 3, Eureka
- Churches Seventh Day Adventist, Eureka
- Cigar, Cigarette & Tobacco Store & Supplies, Eureka
- Cigarettes Manufacturers, Eureka
- City & County Administrative Agencies, Eureka
- City & County Correctional Facilities, Eureka
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- City & County Government, Eureka
- Cleaning & Maintenance Services, Eureka
- Clinics, Eureka
- Clothing Stores, Eureka - Clothes & Accessories
- CNC Machine Shop, Eureka
- Commercial Equipment, Eureka
- Communications Cable Contractors, Eureka
- Community & Recreational Facilities, Eureka
- Community Services, Eureka
- Computer & Software Stores, Eureka
- Computer Stores, Eureka
- Computers Dealers Used & Refurbished, Eureka
- Concrete, Eureka - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Eureka
- Concrete Product Manufacturers, Eureka
- Construction, Eureka
- Construction Services, Eureka
- Consultants & Services, Eureka
- Convenience Stores, Eureka
- Convention & Meeting Facilities, Eureka - Meeting Rooms
- Courier Service, Eureka
- Credit Unions, Eureka
- Crime Prevention Services, Eureka
- Crude Petroleum & Natural Gas, Eureka
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