- Cable TV Companies & Services, Mayville
- Career & Vocational Counseling, Mayville
- Carpet, Rug & Linoleum Flooring Dealers, Mayville
- Cars, Truck, Van & SUV Car Dealerships, Mayville - Auto Dealers
- Casual Dining Restaurants, Mayville
- Catholic Churches, Mayville
- Central American Restaurants, Mayville
- Chemical Products, Mayville - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals Agricultural, Mayville
- Child Care & Day Care Services, Mayville
- Chiropractor, Mayville
- Churches 1 Of 3, Mayville
- City & County Government, Mayville
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- City & County Law Enforcement, Mayville
- Clinics, Mayville
- Colleges & Universities, Mayville
- Communications Services, Mayville
- Community Services, Mayville
- Computer & Audio Visual Services, Mayville
- Condiments & Sauces, Mayville
- Construction, Mayville
- Construction & Civil Engineer, Mayville
- Consultants & Services, Mayville
- Contact Lenses, Mayville
- Crop Planting & Protecting, Mayville - Soil Preparation & Cultivating
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