- Cabinets & Cabinet Hardware, Sidney
- Cafe Restaurants, Sidney
- Calendars Retail, Sidney
- Cancer Educational, Referral & Support Service Centers, Sidney
- Cancer Treatment & Information Services , Sidney
- Car Rental, Sidney - Rental Cars & Lease Service
- Carpet Installation & Cleaning - Commercial & Industrial, Sidney - Rug Cleaners
- Carpet Rug & Upholstery Cleaners, Sidney
- Carpet, Rug & Linoleum Flooring Dealers, Sidney
- Cars, Truck, Van & SUV Car Dealerships, Sidney - Auto Dealers
- Casual Dining Restaurants, Sidney
- Catholic Churches, Sidney
- Chambers Of Commerce, Sidney
- Child Care & Day Care Services, Sidney
- Child Related Social Services, Sidney
- Chinese Restaurants, Sidney
- Chiropractor, Sidney
- Christian Churches, Sidney
- Church Of Christ, Sidney
- Churches 1 Of 3, Sidney
- Churches 2 Of 3, Sidney
- Cigar, Cigarette & Tobacco Store & Supplies, Sidney
- City & County Administrative Agencies, Sidney
- City & County Government, Sidney
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- Cleaning & Maintenance Services, Sidney
- Clinics, Sidney
- Clothing Stores, Sidney - Clothes & Accessories
- Commercial Printing Manufacturers, Sidney
- Communications Services, Sidney
- Community & Recreational Facilities, Sidney
- Community Services, Sidney
- Computer & Equipment Rental & Leasing, Sidney
- Computer & Laptop Repair, Sidney - PC Repair Services
- Computer & Software Stores, Sidney
- Computer Repair, Sidney
- Computer Stores, Sidney
- Concrete Contractors, Sidney - Concrete Construction & Concrete Companies
- Congregational Church, Sidney
- Construction, Sidney
- Construction Services, Sidney
- Consultants & Services, Sidney
- Convenience Stores, Sidney
- Counseling Services, Sidney
- Craft Supplies, Sidney - Hobby & Craft Stores
- Credit Card Plan Services, Sidney
- Credit Unions, Sidney
- Cruise Agents, Sidney - Travel Agents
- Cruise Lines, Sidney - Cruises
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