- Radiator Coolant & Solvents, Trenton - Engine Coolant
- Radio Stations & Broadcasting Companies, Trenton
- Ready Mix Concrete, Trenton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Trenton
- Real Estate, Trenton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Trenton
- Real Estate Services, Trenton
- Recreational Services, Trenton
- Recycling Scrap & Waste Materials, Trenton - Scrap Metal, etc
- Refrigerator Sales, Service & Repair, Trenton - Fridge
- Rehabilitational Job Training Services, Trenton
- Religious Organizations, Trenton
- Religious Practitioners, Trenton
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- Residential, Trenton
- Residential Apartments, Trenton
- Residential Care Facilities, Trenton
- Restaurants/Food & Dining, Trenton
- Retirement Communities & Home, Assisted Living & Apartments, Trenton
- Retirement Home Referral Service, Trenton - Nursing Home & Care Facilities Referrals & Information
- Riding Equipment, Trenton
- Road Boring Contractors, Trenton
- Road Construction & Repair Contractors, Trenton
- Rodeo & Equestrian Equipment & Supplies, Trenton
- Roofing Consultants, Trenton - Roofing Companies
- Roofing Contractors, Trenton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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