- Racing Car Supplies, Williston
- Radio & Television Repair Shops , Williston - TV Repair
- Radio Communications Equipment & Systems , Williston
- Ready Mix Concrete, Williston - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Williston
- Real Estate, Williston - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Williston
- Real Estate Appraiser, Williston - Appraisal Services
- Real Estate Appraisers & Consulting Services, Williston
- Real Estate Developers, Williston
- Real Estate Services, Williston
- Record Storage, Destruction & Management, Williston
- Records, Tapes, CDs - Used & Vintage, Williston
- Recreational Good Manufacturers, Williston
- Recreational Organizations, Williston
- Recycling Drop-Off Centers, Williston
- Recycling Scrap & Waste Materials, Williston - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Williston - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Williston - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Williston - Ac, Freezer, Refrigerator Repair
- Refuse Collection & Disposal Services, Williston
- Refuse Systems & Garbage Disposal, Williston
- Rehabilitational Job Training Services, Williston
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- Religious Organizations, Williston
- Rendering Companies, Williston
- Repair Services, Williston
- Research & Development Bureaus, Williston - Commercial, Economic, Sociological & Educational Research
- Research & Development Engineers, Williston
- Research Services, Williston
- Residential, Williston
- Residential Construction Contractors, Williston - General Contractors
- Residential Electricians, Williston - Electric Contractors
- Residential Landfills, Williston
- Resource Centers, Williston
- Restaurant Equipment Repair & Service, Williston - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, Williston - Food Facilities Consultants
- Restaurants/Food & Dining, Williston
- Restoration Contractors, Williston
- Retirement Communities & Home, Assisted Living & Apartments, Williston
- Riding & Rodeo Services, Williston
- Rigging Equipment & Supplies, Williston
- Rigging Service & Crane Hoisting, Williston
- Roofing Consultants, Williston - Roofing Companies
- Roofing Contractors, Williston - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Williston
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