- Radio & Tv Communications Equipment Manufacturers, Petersburg
- Railroad Cars Manufacturers, Petersburg
- Railroad Equipment & Supplies Manufacturers, Petersburg
- Ready Mix Concrete, Petersburg - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Petersburg
- Real Estate, Petersburg - Agent, Broker & Companies
- Recreational Services, Petersburg
- Refuse Collection & Disposal Services, Petersburg
- Refuse Systems & Garbage Disposal, Petersburg
- Rehabilitation Centers, Products & Services, Petersburg
- Rehabilitation Specialists, Petersburg
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- Religious Education, Petersburg
- Religious Organizations, Petersburg
- Repair Services, Petersburg
- Residential, Petersburg
- Residential Apartments, Petersburg
- Residential Care Facilities, Petersburg
- Residential Construction Contractors, Petersburg - General Contractors
- Residential Real Estate - Rental & Leasing, Petersburg
- Restaurants/Food & Dining, Petersburg
- Retirement & Estate Planning, Petersburg
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