- Carpenters, Hortonville - Carpentry Contractors
- Carpet, Rug & Linoleum Flooring Dealers, Hortonville
- Cars, Truck, Van & SUV Car Dealerships, Hortonville - Auto Dealers
- Casual Dining Restaurants, Hortonville
- Catholic Churches, Hortonville
- Chiropractor, Hortonville
- Churches 1 Of 3, Hortonville
- City & County Administrative Agencies, Hortonville
- City & County Government, Hortonville
- City & County Law Enforcement, Hortonville
- CNC Machine Shop, Hortonville
- Coating Applicators Protective Coatings, Hortonville
- Coating Engraving & Allied Services Manufacturing, Hortonville
- Commercial Equipment, Hortonville
- Commercial Printing, Hortonville
- Commercial Printing Manufacturers, Hortonville
- Community & Recreational Facilities, Hortonville
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- Community Services, Hortonville
- Concrete Breaking, Coring, Cutting, Drilling & Sawing, Hortonville
- Concrete Contractors, Hortonville - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Hortonville
- Construction, Hortonville
- Construction Inspectors, Hortonville
- Construction Services, Hortonville
- Consultants & Services, Hortonville
- Contractor Equipment & Supplies, Hortonville - Construction Equipment & Machinery
- Control Systems & Regulators, Hortonville
- Convenience Stores, Hortonville
- Country Cooking Restaurants, Hortonville
- County Police, Hortonville
- Credit Card Merchant Services, Hortonville
- Credit Card Plan Services, Hortonville
- Curtains, Drapes & Window Treatments and Coverings, Hortonville - Drapery & Upholstery Fabric Stores
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