- Radio Stations & Broadcasting Companies, Mayville
- Radiotelephone Communications, Mayville
- Ready Mix Concrete, Mayville - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Mayville
- Real Estate, Mayville - Agent, Broker & Companies
- Real Estate Developers, Mayville
- Real Estate Rentals, Mayville
- Real Estate Services, Mayville
- Refrigeration & Cooling Equipment, Parts & Supplies , Mayville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Mayville - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Mayville - Fridge
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- Rehabilitation Centers, Products & Services, Mayville
- Rehabilitation Specialists, Mayville
- Religious Education, Mayville
- Religious Organizations, Mayville
- Repair Services, Mayville
- Residential, Mayville
- Residential Apartments, Mayville
- Residential Care Facilities, Mayville
- Restaurants/Food & Dining, Mayville
- Roofing Materials & Supplies, Mayville
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