- Radiator Coolant & Solvents, Clarksburg - Engine Coolant
- Radiator Repair, Clarksburg - Gas Tank Repair
- Radio & Television Repair Shops , Clarksburg - TV Repair
- Radio Stations & Broadcasting Companies, Clarksburg
- Radon Testing & Services, Clarksburg
- Railroad & Subway Construction Contractors, Clarksburg
- Railroad Companies, Clarksburg
- Railroad Contractors, Clarksburg
- Rape Victim Services, Clarksburg
- Real Estate, Clarksburg - Agent, Broker & Companies
- Real Estate Appraiser, Clarksburg - Appraisal Services
- Real Estate Appraisers & Consulting Services, Clarksburg
- Real Estate Attorneys & Lawyers, Clarksburg
- Real Estate Developers, Clarksburg
- Real Estate Management, Clarksburg
- Real Estate Rentals, Clarksburg
- Real Estate Services, Clarksburg
- Record Storage, Destruction & Management, Clarksburg
- Recycling Drop-Off Centers, Clarksburg
- Recycling Scrap & Waste Materials, Clarksburg - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Clarksburg
- Refrigeration & Cooling Equipment, Parts & Supplies , Clarksburg - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Clarksburg - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Clarksburg
- Refuse Collection & Disposal Services, Clarksburg
- Refuse Systems & Garbage Disposal, Clarksburg
- Rehabilitation Centers, Products & Services, Clarksburg
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- Rehabilitation Specialists, Clarksburg
- Relief Organizations, Clarksburg
- Religious Education, Clarksburg
- Religious Organizations, Clarksburg
- Rental & Leasing Business Equipment, Clarksburg
- Repair Services, Clarksburg
- Research Clinics, Clarksburg
- Residential, Clarksburg
- Residential Apartments, Clarksburg
- Residential Care Facilities, Clarksburg
- Residential Construction Contractors, Clarksburg - General Contractors
- Resorts & Hotels, Clarksburg
- Restaurant Equipment, Clarksburg
- Restaurant Equipment & Supplies, Clarksburg
- Restaurant Equipment Repair & Service, Clarksburg - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Clarksburg
- Restaurants/Food & Dining, Clarksburg
- Retail Book Stores, Clarksburg
- Retirement & Estate Planning, Clarksburg
- Retirement Planning Consultants & Services, Clarksburg
- Rheumatologists, Clarksburg - Rheumatology Doctors, Physicians & Surgeons
- Rigging Service & Crane Hoisting, Clarksburg
- Roadside Assistance, Road Service & Towing Service, Clarksburg
- Roofing Consultants, Clarksburg - Roofing Companies
- Roofing Contractors, Clarksburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Clarksburg
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