- Racquetball Equipment & Supplies, Williamsville
- Radio & Television Repair Shops , Williamsville - TV Repair
- Real Estate, Williamsville - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Williamsville
- Real Estate Appraiser, Williamsville - Appraisal Services
- Real Estate Appraisers & Consulting Services, Williamsville
- Real Estate Developers, Williamsville
- Real Estate Management, Williamsville
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- Recreational Services, Williamsville
- Reducing Exercise & Weight Control Services, Williamsville
- Rehabilitational Job Training Services, Williamsville
- Religious Organizations, Williamsville
- Repair Services, Williamsville
- Research & Development Bureaus, Williamsville - Commercial, Economic, Sociological & Educational Research
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- Research & Development Labs, Williamsville - Laboratories
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- Residential, Williamsville
- Residential Apartments, Williamsville
- Residential Architect, Williamsville
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- Restaurants/Food & Dining, Williamsville
- Retirement Communities & Home, Assisted Living & Apartments, Williamsville
- Road Construction, Williamsville - Companies & Contractors
- Roofing Consultants, Williamsville - Roofing Companies
- Roofing Contractors, Williamsville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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