- Radiator Coolant & Solvents, Waterloo - Engine Coolant
- Ready Mix Concrete, Waterloo - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Waterloo
- Real Estate, Waterloo - Agent, Broker & Companies
- Real Estate Appraisers & Consulting Services, Waterloo
- Real Estate Services, Waterloo
- Recording Studio - Equipment & Rental, Waterloo
- Recreational Services, Waterloo
- Recreational Vehicles & Campers Rent & Lease, Waterloo
- Refrigerator Sales, Service & Repair, Waterloo - Fridge
- Refuse Collection & Disposal Services, Waterloo
- Rehabilitational Job Training Services, Waterloo
- Religious Organizations, Waterloo
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- Repair Services, Waterloo
- Residential Care Facilities, Waterloo
- Restaurant Equipment Repair & Service, Waterloo - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurants/Food & Dining, Waterloo
- Resume Service, Waterloo
- Retirement Communities & Home, Assisted Living & Apartments, Waterloo
- Retirement Homes, Waterloo
- Riding & Rodeo Services, Waterloo
- Roofing Consultants, Waterloo - Roofing Companies
- Roofing Contractors, Waterloo - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Waterloo
- Rvs Sales, Rental & Leasing, Waterloo
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