- Racing Including Track Operations, Petersburg
- Radiator Coolant & Solvents, Petersburg - Engine Coolant
- Radiator Repair, Petersburg - Gas Tank Repair
- Radio & Television Repair Shops , Petersburg - TV Repair
- Radio Stations & Broadcasting Companies, Petersburg
- Railroad, Petersburg - Commuter & Passenger Transport
- Railroad Companies, Petersburg
- Ready Mix Concrete, Petersburg - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Petersburg
- Real Estate, Petersburg - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Petersburg
- Real Estate Appraiser, Petersburg - Appraisal Services
- Real Estate Appraisers & Consulting Services, Petersburg
- Real Estate Management, Petersburg
- Real Estate Services, Petersburg
- Recycling Drop-Off Centers, Petersburg
- Recycling Scrap & Waste Materials, Petersburg - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Petersburg
- Rehabilitation Centers, Products & Services, Petersburg
- Rehabilitation Specialists, Petersburg
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- Religious Organizations, Petersburg
- Religious Practitioners, Petersburg
- Relocation Services, Petersburg
- Repair Services, Petersburg
- Research & Development Bureaus, Petersburg - Commercial, Economic, Sociological & Educational Research
- Research Services, Petersburg
- Residential, Petersburg
- Residential Apartments, Petersburg
- Residential Care Facilities, Petersburg
- Residential Construction Contractors, Petersburg - General Contractors
- Residential Landfills, Petersburg
- Residential Real Estate - Rental & Leasing, Petersburg
- Resins Wholesale & Retail, Petersburg - Plastic Raw Materials
- Restaurant & Lounge, Bar, Or Pub, Petersburg
- Restaurants/Food & Dining, Petersburg
- Retirement Communities & Home, Assisted Living & Apartments, Petersburg
- Reverends, Petersburg
- Rhema Church, Petersburg
- Roofing Consultants, Petersburg - Roofing Companies
- Roofing Contractors, Petersburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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