- Racing Car Supplies, Williamstown
- Radiator Coolant & Solvents, Williamstown - Engine Coolant
- Radio Station Equipment & Systems, Williamstown
- Radio Stations & Broadcasting Companies, Williamstown
- Range & Oven Repair, Service & Sales, Williamstown
- Real Estate, Williamstown - Agent, Broker & Companies
- Real Estate Developers, Williamstown
- Real Estate Management, Williamstown
- Real Estate Services, Williamstown
- Recreational Equipment & Supplies Companies, Williamstown
- Recycling Drop-Off Centers, Williamstown
- Recycling Scrap & Waste Materials, Williamstown - Scrap Metal, etc
- Refreshment Stands, Williamstown
- Refrigeration & Cooling Equipment, Parts & Supplies , Williamstown - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Williamstown - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Williamstown - Fridge
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- Religious Organizations, Williamstown
- Religious Services, Williamstown
- Repair Services, Williamstown
- Research Services, Williamstown
- Residential, Williamstown
- Residential Apartments, Williamstown
- Residential Care Facilities, Williamstown
- Residential Construction Contractors, Williamstown - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Williamstown
- Restaurants/Food & Dining, Williamstown
- Retail Book Stores, Williamstown
- Retirement Communities & Home, Assisted Living & Apartments, Williamstown
- Riding Apparel & Equipment, Williamstown
- Roofing Consultants, Williamstown - Roofing Companies
- Roofing Contractors, Williamstown - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Williamstown
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