- Racing Car Supplies, Mason City
- Radio Communications Equipment & Systems , Mason City
- Radio Stations & Broadcasting Companies, Mason City
- Radiologists, Mason City - Radiology Doctors, Physicians & Surgeons
- Railroad Companies, Mason City
- Ready Mix Concrete, Mason City - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Mason City
- Real Estate, Mason City - Agent, Broker & Companies
- Real Estate Appraiser, Mason City - Appraisal Services
- Real Estate Appraisers & Consulting Services, Mason City
- Real Estate Consultants, Mason City
- Real Estate Developers, Mason City
- Real Estate Farms & Ranches, Mason City
- Real Estate Properties, Mason City
- Real Estate Services, Mason City
- Recreational Equipment Repair & Service, Mason City
- Recycling Drop-Off Centers, Mason City
- Recycling Scrap & Waste Materials, Mason City - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Mason City - Warehousing
- Refrigeration & Air Conditioning Contractors, Mason City - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Mason City - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Mason City - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Mason City
- Refrigerator Sales, Service & Repair, Mason City - Fridge
- Rehabilitation Centers, Mason City
- Rehabilitation Centers, Products & Services, Mason City
- Rehabilitation Specialists, Mason City
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- Rehabilitational Job Training Services, Mason City
- Relief Organizations, Mason City
- Religious Education, Mason City
- Religious Organizations, Mason City
- Rental & Leasing Business Equipment, Mason City
- Repair Services, Mason City
- Research Services, Mason City
- Residential, Mason City
- Residential Apartments, Mason City
- Residential Architect, Mason City
- Residential Care Facilities, Mason City
- Residential Construction Contractors, Mason City - General Contractors
- Restaurant Equipment Repair & Service, Mason City - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Mason City
- Retail Book Stores, Mason City
- Retaining Wall Contractors, Mason City - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement & Estate Planning, Mason City
- Retirement Communities & Home, Assisted Living & Apartments, Mason City
- Retirement Planning Consultants & Services, Mason City
- Rigging Service & Crane Hoisting, Mason City
- Roadside Assistance, Road Service & Towing Service, Mason City
- Roofing Consultants, Mason City - Roofing Companies
- Roofing Contractors, Mason City - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Mason City
- Rubber & Plastic Products, Mason City
- Rubber Products - Manufacturers, Mason City
- Ryder Truck Rental , Mason City - Ryder Moving
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