- Cafe Restaurants, Platteville
- Camper, Rvs & Travel Trailer Dealers, Platteville
- Carpet Rug & Upholstery Cleaners, Platteville
- Cars, Truck, Van & SUV Car Dealerships, Platteville - Auto Dealers
- Casual Dining Restaurants, Platteville
- Catholic Churches, Platteville
- Central American Restaurants, Platteville
- Chemical Product Manufacturers, Platteville
- Chemical Products, Platteville - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals & Related Products, Platteville
- Chemicals Agricultural, Platteville
- Chiropractor, Platteville
- Churches 1 Of 3, Platteville
- City & County Administrative Agencies, Platteville
- City & County Government, Platteville
- Cleaning & Maintenance Services, Platteville
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- CNC Machine Shop, Platteville
- Communications Consultants, Platteville
- Communications Services, Platteville
- Community Services, Platteville
- Computer & Laptop Repair, Platteville - PC Repair Services
- Computer Networks, Platteville - Design & Systems
- Concrete, Platteville - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Platteville
- Concrete Construction Forms & Accessories, Platteville
- Concrete Contractors, Platteville - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Platteville
- Construction, Platteville
- Construction Services, Platteville
- Consultants & Services, Platteville
- Convenience Stores, Platteville
- Crude Petroleum & Natural Gas, Platteville
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