- Racing Car Supplies, Aylmer
- Radiator Coolant & Solvents, Aylmer - Engine Coolant
- Radio Stations & Broadcasting Companies, Aylmer
- Real Estate, Aylmer - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Aylmer
- Real Estate Broker, Aylmer
- Real Estate Services, Aylmer
- Reformed Churches, Aylmer
- Religious Education, Aylmer
- Religious Organizations, Aylmer
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- Repair Services, Aylmer
- Residential Care Facilities, Aylmer
- Restaurant & Food Service Management Services, Aylmer
- Restaurants/Food & Dining, Aylmer
- Retirement Communities & Home, Assisted Living & Apartments, Aylmer
- Roadside Assistance, Road Service & Towing Service, Aylmer
- Roofing Consultants, Aylmer - Roofing Companies
- Roofing Contractors, Aylmer - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Aylmer
- Rv Parks, Aylmer
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