- Cabins Cottages & Chalet Rental, Idaho Springs
- Cafe Restaurants, Idaho Springs
- Campgrounds, Idaho Springs
- Candy, Nut & Confectionery Wholesale & Retail, Idaho Springs - Candy Stores
- Car Detailing & Wash Service, Idaho Springs - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Idaho Springs
- Carnivals, Fairs & Exhibitions, Idaho Springs
- Carpet Rug & Upholstery Cleaners, Idaho Springs
- Casual Dining Restaurants, Idaho Springs
- Catholic Churches, Idaho Springs
- Central American Restaurants, Idaho Springs
- Charitable & Non-Profit Organizations, Idaho Springs
- Child Related Social Services, Idaho Springs
- Children's Clothing Stores, Idaho Springs - Infant, Babies & Kids Clothing
- Chinese Restaurants, Idaho Springs
- Chiropractor, Idaho Springs
- Chocolate & Cocoa, Idaho Springs
- Churches 1 Of 3, Idaho Springs
- City & County Administrative Agencies, Idaho Springs
- City & County Government, Idaho Springs
- Cleaning & Maintenance Services, Idaho Springs
- Clinics, Idaho Springs
- Clothing Stores, Idaho Springs - Clothes & Accessories
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- Coal Miner & Shippers, Idaho Springs - Coal Mining
- Coffee & Tea Stores, Idaho Springs
- Coffee, Espresso & Tea House Restaurants, Idaho Springs
- Colleges & Universities, Idaho Springs
- Comedy Clubs & Dance Clubs, Idaho Springs
- Commercial Equipment, Idaho Springs
- Commercial Printing Manufacturers, Idaho Springs
- Commercial, Industrial & Office Space for Rent & Lease, Idaho Springs
- Communications Consultants, Idaho Springs
- Communications Services, Idaho Springs
- Community & Recreational Facilities, Idaho Springs
- Community Services, Idaho Springs
- Concrete, Idaho Springs - Cement & Concrete Products, Suppliers, Companies
- Concrete Additives, Idaho Springs
- Concrete Contractors, Idaho Springs - Concrete Construction & Concrete Companies
- Condominiums & Townhomes for Rent, Idaho Springs - Townhouses & Condos for Rent & Lease
- Construction, Idaho Springs
- Construction Services, Idaho Springs
- Consultants & Services, Idaho Springs
- Convenience Stores, Idaho Springs
- Cooking, Food & Beverage Equipment, Idaho Springs
- Cosmetics & Perfumes Outlets, Idaho Springs
- Custom Parts & Accessories, Idaho Springs
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