- Radiator Coolant & Solvents, Humboldt - Engine Coolant
- Radiator Repair, Humboldt - Gas Tank Repair
- Radiator Repair & Rebuild, Humboldt
- Radio & Television Repair Shops , Humboldt - TV Repair
- Radio Communications Equipment & Systems , Humboldt
- Radio Stations & Broadcasting Companies, Humboldt
- Raw Products, Humboldt
- Ready Mix Concrete, Humboldt - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Humboldt
- Real Estate, Humboldt - Agent, Broker & Companies
- Real Estate Appraiser, Humboldt - Appraisal Services
- Real Estate Appraisers & Consulting Services, Humboldt
- Real Estate Services, Humboldt
- Records, Tapes, CDs - Used & Vintage, Humboldt
- Recreational Organizations, Humboldt
- Recycling Drop-Off Centers, Humboldt
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- Recycling Scrap & Waste Materials, Humboldt - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , Humboldt - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Humboldt - Ac, Freezer, Refrigerator Repair
- Rehabilitation Centers, Products & Services, Humboldt
- Rehabilitation Specialists, Humboldt
- Religious Organizations, Humboldt
- Religious Practitioners, Humboldt
- Repair Services, Humboldt
- Research & Development Bureaus, Humboldt - Commercial, Economic, Sociological & Educational Research
- Research Services, Humboldt
- Residential Care Facilities, Humboldt
- Restaurants/Food & Dining, Humboldt
- Retail Book Stores, Humboldt
- Retirement Communities & Home, Assisted Living & Apartments, Humboldt
- Rigging Service & Crane Hoisting, Humboldt
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