- Cabins Cottages & Chalet Rental, Mayville
- Cable TV Companies & Services, Mayville
- Cafe Restaurants, Mayville
- Campgrounds, Mayville
- Car Detailing & Wash Service, Mayville - Auto Detailing
- Car Rental, Mayville - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, Mayville
- Casual Dining Restaurants, Mayville
- Catholic Churches, Mayville
- Cellular & Mobile Phone Service, Mayville
- Chambers Of Commerce, Mayville
- Charitable & Non-Profit Organizations, Mayville
- Christian Churches, Mayville
- Church Of Christ, Mayville
- Churches 1 Of 3, Mayville
- City & County Administrative Agencies, Mayville
- City & County Correctional Facilities, Mayville
- City & County Government, Mayville
- Cleaning & Restoration Contractors, Including Sandblasting, Mayville
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- Clothing & Accessories Resale & Consignment Shops, Mayville
- CNC Machine Shop, Mayville
- Coffee, Espresso & Tea House Restaurants, Mayville
- Commercial Equipment, Mayville
- Communications Services, Mayville
- Community Church, Mayville
- Community Churches, Mayville
- Community Services, Mayville
- Condiments & Sauces, Mayville
- Cone & Wafer Products Manufacturers, Mayville
- Construction, Mayville
- Consultants & Services, Mayville
- Convenience Stores, Mayville
- Convention & Meeting Facilities, Mayville - Meeting Rooms
- Credit Card & Plans - Machines, Equipment & Supplies , Mayville - Terminal Systems
- Credit Card Plan Services, Mayville
- Credit Unions, Mayville
- Cremation Services, Supplies & Equipment, Mayville
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