- Radiator Coolant & Solvents, Hawthorne - Engine Coolant
- Railroad Companies, Hawthorne
- Ready Mix Concrete, Hawthorne - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Hawthorne
- Real Estate, Hawthorne - Agent, Broker & Companies
- Real Estate Appraiser, Hawthorne - Appraisal Services
- Real Estate Appraisers & Consulting Services, Hawthorne
- Real Estate Consultants, Hawthorne
- Real Estate Developers, Hawthorne
- Real Estate Services, Hawthorne
- Recycling Drop-Off Centers, Hawthorne
- Reformed Churches, Hawthorne
- Rehabilitation Centers, Hawthorne
- Rehabilitation Centers, Products & Services, Hawthorne
- Rehabilitation Specialists, Hawthorne
- Religious Education, Hawthorne
- Religious Goods & Church Supplies Stores, Hawthorne
- Religious Organizations, Hawthorne
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- Relocation Services, Hawthorne
- Repair Services, Hawthorne
- Research & Development Bureaus, Hawthorne - Commercial, Economic, Sociological & Educational Research
- Research Services, Hawthorne
- Residential, Hawthorne
- Residential Apartments, Hawthorne
- Residential Care Facilities, Hawthorne
- Residential Construction Contractors, Hawthorne - General Contractors
- Restaurant Equipment, Hawthorne
- Restaurant Equipment & Supplies, Hawthorne
- Restaurant Supplies & Equipment, Hawthorne
- Restaurants/Food & Dining, Hawthorne
- Retail Book Stores, Hawthorne
- Retirement Communities & Home, Assisted Living & Apartments, Hawthorne
- Roofing Consultants, Hawthorne - Roofing Companies
- Roofing Contractors, Hawthorne - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Hawthorne
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