- Racing Car Supplies, Windsor
- Radiator Coolant & Solvents, Windsor - Engine Coolant
- Radio Stations & Broadcasting Companies, Windsor
- Ready Mix Concrete, Windsor - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Windsor
- Real Estate, Windsor - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Windsor
- Real Estate Appraiser, Windsor - Appraisal Services
- Real Estate Appraisers & Consulting Services, Windsor
- Real Estate Broker, Windsor
- Real Estate Management, Windsor
- Real Estate Services, Windsor
- Recycling Drop-Off Centers, Windsor
- Reducing Exercise & Weight Control Services, Windsor
- Religious Organizations, Windsor
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- Repair Services, Windsor
- Research & Development Labs, Windsor - Laboratories
- Research Services, Windsor
- Residential, Windsor
- Residential Apartments, Windsor
- Residential Architect, Windsor
- Residential Care Facilities, Windsor
- Resorts & Hotels, Windsor
- Restaurants/Food & Dining, Windsor
- Retirement Communities & Home, Assisted Living & Apartments, Windsor
- Riding & Rodeo Services, Windsor
- Roadside Assistance, Road Service & Towing Service, Windsor
- Roofing Consultants, Windsor - Roofing Companies
- Roofing Contractors, Windsor - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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