- Racing Including Track Operations, Oswego
- Radio & Television Repair Shops , Oswego - TV Repair
- Radio Stations & Broadcasting Companies, Oswego
- Radiologists, Oswego - Radiology Doctors, Physicians & Surgeons
- Rail Line Travel Agents & Agencies, Oswego
- Railroad, Oswego - Commuter & Passenger Transport
- Railroad Companies, Oswego
- Rape Victim Services, Oswego
- Ready Mix Concrete, Oswego - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Oswego
- Real Estate, Oswego - Agent, Broker & Companies
- Real Estate Attorneys & Lawyers, Oswego
- Real Estate Lawyers & Attorneys, Oswego
- Real Estate Management, Oswego
- Real Estate Services, Oswego
- Recreational Equipment Repair & Service, Oswego
- Recycling Drop-Off Centers, Oswego
- Recycling Scrap & Waste Materials, Oswego - Scrap Metal, etc
- Refrigerated Beverage Dispenser, Oswego - Water Coolers Equipment & Supplies
- Refrigeration & Cooling Equipment, Parts & Supplies , Oswego - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Oswego - Ac, Freezer, Refrigerator Repair
- Relief Organizations, Oswego
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- Religious Education, Oswego
- Religious Goods & Church Supplies Stores, Oswego
- Religious Organizations, Oswego
- Rental Property Management, Oswego
- Repair Services, Oswego
- Research Services, Oswego
- Residential, Oswego
- Residential Apartments, Oswego
- Residential Care Facilities, Oswego
- Residential Construction Contractors, Oswego - General Contractors
- Residential Construction Referral Services, Oswego
- Restaurant & Lounge, Bar, Or Pub, Oswego
- Restaurants/Food & Dining, Oswego
- Retail Book Stores, Oswego
- Retirement & Estate Planning, Oswego
- Retirement Communities & Home, Assisted Living & Apartments, Oswego
- Retirement Planning Consultants & Services, Oswego
- Roofing Consultants, Oswego - Roofing Companies
- Roofing Contractors, Oswego - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Oswego
- Rv Parks, Oswego
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