- Racing Including Track Operations, Clarkston
- Radiator Coolant & Solvents, Clarkston - Engine Coolant
- Radiologists, Clarkston - Radiology Doctors, Physicians & Surgeons
- Real Estate, Clarkston - Agent, Broker & Companies
- Real Estate Agencies, Clarkston
- Real Estate Agent - Property Lessors, Clarkston
- Real Estate Appraiser, Clarkston - Appraisal Services
- Real Estate Appraisers & Consulting Services, Clarkston
- Real Estate Consultants, Clarkston
- Real Estate Developers, Clarkston
- Real Estate Management, Clarkston
- Real Estate Properties, Clarkston
- Real Estate Property Investment Properties, Clarkston
- Real Estate Services, Clarkston
- Record Labels, Clarkston - Record Companies
- Record Storage, Destruction & Management, Clarkston
- Recording Studio Service - Sound & Video, Clarkston
- Recreational Equipment & Supplies Companies, Clarkston
- Recycling Drop-Off Centers, Clarkston
- Recycling Scrap & Waste Materials, Clarkston - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Clarkston
- Refrigeration & Cooling Equipment, Parts & Supplies , Clarkston - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Clarkston - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Clarkston
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- Refuse Systems & Garbage Disposal, Clarkston
- Rehabilitation Centers, Products & Services, Clarkston
- Rehabilitation Specialists, Clarkston
- Religious Organizations, Clarkston
- Religious Practitioners, Clarkston
- Relocation Services, Clarkston
- Repair Services, Clarkston
- Research Services, Clarkston
- Residential, Clarkston
- Residential Apartments, Clarkston
- Residential Architect, Clarkston
- Residential Care Facilities, Clarkston
- Residential Construction Contractors, Clarkston - General Contractors
- Residential Real Estate Companies, Clarkston
- Resorts & Hotels, Clarkston
- Restaurants/Food & Dining, Clarkston
- Retirement Communities & Home, Assisted Living & Apartments, Clarkston
- Retreat Facilities & Houses, Clarkston
- Riding Apparel & Equipment, Clarkston
- Robots & Robotics System, Clarkston
- Roofing Consultants, Clarkston - Roofing Companies
- Roofing Contractors, Clarkston - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Clarkston
- RV Repair, Clarkston - Recreational Vehicle
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