- Cable TV Companies & Services, East Helena
- Carpet Rug & Upholstery Cleaners, East Helena
- Casinos, East Helena
- Casual Dining Restaurants, East Helena
- Catholic Churches, East Helena
- Child Care & Day Care Services, East Helena
- Cigar, Cigarette & Tobacco Store & Supplies, East Helena
- City & County Administrative Agencies, East Helena
- City & County Government, East Helena
- Cleaning & Maintenance Services, East Helena
- Clothing Stores, East Helena - Clothes & Accessories
- Colors & Pigments, East Helena
- Commercial Printing Manufacturers, East Helena
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- Commodity & Merchandise Storage & Warehouse, East Helena - Warehousing
- Communications Services, East Helena
- Community & Recreational Facilities, East Helena
- Community Services, East Helena
- Concrete, East Helena - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, East Helena
- Concrete Contractors, East Helena - Concrete Construction & Concrete Companies
- Concrete Handling Services, East Helena - Concrete Pumping
- Concrete Product Manufacturers, East Helena
- Construction, East Helena
- Consultants & Services, East Helena
- Convenience Stores, East Helena
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