- Race Tracks, Hamilton
- Racing Including Track Operations, Hamilton
- Radiator Coolant & Solvents, Hamilton - Engine Coolant
- Radiator Repair, Hamilton - Gas Tank Repair
- Radiator Repair & Rebuild, Hamilton
- Radio & Television Repair Shops , Hamilton - TV Repair
- Radio Communications Equipment & Systems , Hamilton
- Radio Stations & Broadcasting Companies, Hamilton
- Radiotelephone Communications, Hamilton
- Ready Mix Concrete, Hamilton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Hamilton
- Real Estate, Hamilton - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Hamilton
- Real Estate Appraiser, Hamilton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Hamilton
- Real Estate Broker, Hamilton
- Real Estate Developers, Hamilton
- Real Estate Management, Hamilton
- Real Estate Services, Hamilton
- Recreational Equipment & Supplies Companies, Hamilton
- Recycling Drop-Off Centers, Hamilton
- Recycling Scrap & Waste Materials, Hamilton - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Hamilton - Warehousing
- Refrigeration & Air Conditioning Contractors, Hamilton - Installation, Repair, Sales & Service
- Refrigerator Sales, Service & Repair, Hamilton - Fridge
- Refuse Collection & Disposal Services, Hamilton
- Refuse Systems & Garbage Disposal, Hamilton
- Rehabilitation Centers, Products & Services, Hamilton
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- Rehabilitation Specialists, Hamilton
- Religious Education, Hamilton
- Religious Organizations, Hamilton
- Religious Practitioners, Hamilton
- Rental & Leasing Business Equipment, Hamilton
- Repair Services, Hamilton
- Research Services, Hamilton
- Residential, Hamilton
- Residential Apartments, Hamilton
- Residential Care Facilities, Hamilton
- Residential Construction Contractors, Hamilton - General Contractors
- Residential Real Estate - Rental & Leasing, Hamilton
- Restaurant Equipment, Hamilton
- Restaurant Equipment & Supplies, Hamilton
- Restaurant Equipment Repair & Service, Hamilton - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Supplies & Equipment, Hamilton
- Restaurants - Breakfast Brunch Lunch, Hamilton
- Restaurants/Food & Dining, Hamilton
- Retail Book Stores, Hamilton
- Retirement Communities & Home, Assisted Living & Apartments, Hamilton
- Reverends, Hamilton
- Riding & Rodeo Services, Hamilton
- Road Construction Equipment & Machinery, Hamilton
- Rodeo & Equestrian Equipment & Supplies, Hamilton
- Rods, Springs & Suspension Equipment & Supplies, Hamilton
- Roofing Consultants, Hamilton - Roofing Companies
- Roofing Contractors, Hamilton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Hamilton
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