- Radio Stations & Broadcasting Companies, Trenton
- Recreational Equipment & Supplies Companies, Trenton
- Recycling Drop-Off Centers, Trenton
- Recycling Scrap & Waste Materials, Trenton - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , Trenton - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Trenton - Ac, Freezer, Refrigerator Repair
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- Religious Organizations, Trenton
- Repair Services, Trenton
- Restaurant Equipment Repair & Service, Trenton - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Trenton
- Roofing Consultants, Trenton - Roofing Companies
- Roofing Contractors, Trenton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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