- Radiator Coolant & Solvents, Dunnville - Engine Coolant
- Real Estate, Dunnville - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Dunnville
- Real Estate Agent - Property Lessors, Dunnville
- Real Estate Broker, Dunnville
- Real Estate Developers, Dunnville
- Real Estate Services, Dunnville
- Recreational Equipment & Supplies Companies, Dunnville
- Refiners & Smelters Metals, Dunnville
- Reformed Churches, Dunnville
- Religious Organizations, Dunnville
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- Repair Services, Dunnville
- Research Services, Dunnville
- Residential Care Facilities, Dunnville
- Restaurant & Lounge, Bar, Or Pub, Dunnville
- Restaurants/Food & Dining, Dunnville
- Retirement Communities & Home, Assisted Living & Apartments, Dunnville
- Riding Apparel & Equipment, Dunnville
- Rodeo & Equestrian Equipment & Supplies, Dunnville
- Roofing Consultants, Dunnville - Roofing Companies
- Roofing Contractors, Dunnville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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