- Cabins Cottages & Chalet Rental, Sidney
- Cable TV Companies & Services, Sidney
- Campers & Pick-Up Canopies Parts & Supplies, Sidney
- Cancer Educational, Referral & Support Service Centers, Sidney
- Cancer Treatment & Information Services , Sidney
- Candy Manufacturers, Sidney
- Candy, Nut & Confectionery Wholesale & Retail, Sidney - Candy Stores
- Car Detailing & Wash Service, Sidney - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Sidney
- Cardiologists, Sidney - Heart Doctors, Physicians & Surgeons (Cardiology)
- Carpet Rug & Upholstery Cleaners, Sidney
- Carpet, Rug & Linoleum Flooring Dealers, Sidney
- Cars, Truck, Van & SUV Car Dealerships, Sidney - Auto Dealers
- Cartage Truck Line, Sidney
- Casual Dining Restaurants, Sidney
- Caterers Food Services, Sidney
- Catholic Churches, Sidney
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Sidney
- Cellular & Mobile Phone Service, Sidney
- Central American Restaurants, Sidney
- Ceramic Tile Flooring, Sidney
- Ceramic Tile Installation - Repair, Sidney - Ceramic Tiles Contractors
- Chambers Of Commerce, Sidney
- Check Advance Service, Sidney
- Check Cashing Services, Sidney
- Child Care & Day Care Services, Sidney
- Child Related Social Services, Sidney
- Chinese Restaurants, Sidney
- Chiropractor, Sidney
- Christian Churches, Sidney
- Church Of Christ, Sidney
- Church Of Jesus Christ Of Latter Day Saints, Sidney
- Church Of The Nazarene, Sidney
- Churches 1 Of 3, Sidney
- Churches 2 Of 3, Sidney
- Churches Seventh Day Adventist, Sidney
- Cigar, Cigarette & Tobacco Store & Supplies, Sidney
- City & County Administrative Agencies, Sidney
- City & County Government, Sidney
- City & County Law Enforcement, Sidney
- Cleaning & Maintenance Services, Sidney
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- Cleaning & Restoration Contractors, Including Sandblasting, Sidney
- Clinics, Sidney
- Clothing Stores, Sidney - Clothes & Accessories
- CNC Machine Shop, Sidney
- Colleges & Universities, Sidney
- Commercial & Industrial Laundry, Sidney
- Commercial Printing, Sidney
- Commodity & Merchandise Storage & Warehouse, Sidney - Warehousing
- Communications Services, Sidney
- Community & Recreational Facilities, Sidney
- Community Centers, Sidney
- Community Services, Sidney
- Computer & Audio Visual Services, Sidney
- Concrete, Sidney - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Sidney
- Concrete & Pumice Bricks, Sidney
- Concrete Contractors, Sidney - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Sidney
- Construction, Sidney
- Construction & Civil Engineer, Sidney
- Construction Equipment Rental & Leasing, Sidney
- Construction Services, Sidney
- Consultants & Services, Sidney
- Contact Lenses, Sidney
- Contractor Equipment & Supplies, Sidney - Construction Equipment & Machinery
- Convalescent Homes Placement Services, Sidney - Convalescent Care
- Convenience Stores, Sidney
- Cooling System & Parts, Sidney - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Cosmetics, Sidney
- Cosmetics & Perfumes Outlets, Sidney
- Craft Supplies, Sidney - Hobby & Craft Stores
- Crane Services, Sidney
- Cranes Hoisting & Rigging Service, Sidney - Crane Rental Service
- Credit & Debt Counseling Services, Sidney
- Crime Prevention Services, Sidney
- Criminal Attorneys & Lawyers, Sidney
- Criminal Defense Attorneys & Lawyers, Sidney
- Criminal Defense Lawyers & Attorneys, Sidney
- Crude Petroleum & Natural Gas, Sidney
- Custom Sewing & Alterations, Sidney
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