- Radiator Coolant & Solvents, Fostoria - Engine Coolant
- Radio & Television Repair Shops , Fostoria - TV Repair
- Radio Stations & Broadcasting Companies, Fostoria
- Railroad Companies, Fostoria
- Ready Mix Concrete, Fostoria - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Fostoria
- Real Estate, Fostoria - Agent, Broker & Companies
- Real Estate Appraisers & Consulting Services, Fostoria
- Real Estate Consultants, Fostoria
- Real Estate Services, Fostoria
- Recycling Drop-Off Centers, Fostoria
- Recycling Scrap & Waste Materials, Fostoria - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Fostoria
- Refrigeration & Cooling Equipment, Parts & Supplies , Fostoria - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Fostoria - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Fostoria
- Rehabilitation Centers, Products & Services, Fostoria
- Rehabilitation Specialists, Fostoria
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- Relief Organizations, Fostoria
- Religious Education, Fostoria
- Religious Organizations, Fostoria
- Rental & Leasing Business Equipment, Fostoria
- Repair Services, Fostoria
- Research Services, Fostoria
- Residential, Fostoria
- Residential Apartments, Fostoria
- Residential Care Facilities, Fostoria
- Residential Construction Contractors, Fostoria - General Contractors
- Residential Landfills, Fostoria
- Restaurants/Food & Dining, Fostoria
- Retail Book Stores, Fostoria
- Retirement Communities & Home, Assisted Living & Apartments, Fostoria
- Roofing Consultants, Fostoria - Roofing Companies
- Roofing Contractors, Fostoria - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Fostoria
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