- Radiator Repair, Humboldt - Gas Tank Repair
- Radio Stations & Broadcasting Companies, Humboldt
- Radiotelephone Communications, Humboldt
- Ready Mix Concrete, Humboldt - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Humboldt
- Real Estate, Humboldt - Agent, Broker & Companies
- Real Estate Developers, Humboldt
- Real Estate Services, Humboldt
- Refrigerated Storage & Warehouse, Humboldt - Warehousing
- Refrigeration Repair & Service, Humboldt - Ac, Freezer, Refrigerator Repair
- Rehabilitational Job Training Services, Humboldt
- Religious Organizations, Humboldt
- Remington Tires, Humboldt - Dealers
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- Rental & Leasing Business Equipment, Humboldt
- Repair Services, Humboldt
- Residential, Humboldt
- Residential Apartments, Humboldt
- Residential Care Facilities, Humboldt
- Residential Construction Contractors, Humboldt - General Contractors
- Restaurant Equipment Repair & Service, Humboldt - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Humboldt
- Retirement Communities & Home, Assisted Living & Apartments, Humboldt
- Roadside Assistance, Road Service & Towing Service, Humboldt
- Roofing Contractors, Humboldt - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Ryder Truck Rental , Humboldt - Ryder Moving
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