- Campgrounds, Mayville
- Casual Dining Restaurants, Mayville
- Catholic Churches, Mayville
- Cellular & Mobile Phone Service, Mayville
- Chemical Products, Mayville - Chemical Distributors, Dealers, Wholesale, etc
- Christian Churches, Mayville
- Churches 1 Of 3, Mayville
- City & County Government, Mayville
- Clinics, Mayville
- Commercial & Industrial Laundry, Mayville
- Communications Services, Mayville
- Community & Recreational Facilities, Mayville
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- Community Services, Mayville
- Computer & Audio Visual Services, Mayville
- Computer & Laptop Repair, Mayville - PC Repair Services
- Computer & Software Stores, Mayville
- Computer Manufacturers, Mayville
- Computer Repair, Mayville
- Computer Stores, Mayville
- Computer System Consultants, Mayville - IT Consulting Services
- Computers Dealers Used & Refurbished, Mayville
- Construction, Mayville
- Convention & Meeting Facilities, Mayville - Meeting Rooms
- CV Joint & Axle, Mayville
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