- Racing Car Supplies, Newmarket
- Radio & Television Repair Shops , Newmarket - TV Repair
- Radio Communications Equipment & Systems , Newmarket
- Radio Stations & Broadcast Companies, Newmarket - Radio, Television & Publishers Representatives
- Radiotelephone Communications, Newmarket
- Ready Mix Concrete, Newmarket - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Newmarket
- Real Estate, Newmarket - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Newmarket
- Real Estate Agent - Property Lessors, Newmarket
- Real Estate Appraiser, Newmarket - Appraisal Services
- Real Estate Appraisers & Consulting Services, Newmarket
- Real Estate Attorneys & Lawyers, Newmarket
- Real Estate Attorneys & Lawyers, Newmarket
- Real Estate Broker, Newmarket
- Real Estate Consultants, Newmarket
- Real Estate Developers, Newmarket
- Real Estate Lawyers & Attorneys, Newmarket
- Real Estate Management, Newmarket
- Real Estate Rentals, Newmarket
- Real Estate Services, Newmarket
- Real Estate Staging Service, Newmarket
- Record Destruction Service, Newmarket
- Record Storage, Destruction & Management, Newmarket
- Recording Studio - Equipment & Rental, Newmarket
- Records, Tapes, CDs - Used & Vintage, Newmarket
- Recreational Equipment & Supplies Companies, Newmarket
- Recreational Good Manufacturers, Newmarket
- Recycling Drop-Off Centers, Newmarket
- Recycling Scrap & Waste Materials, Newmarket - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Newmarket
- Reflexologists, Newmarket
- Refrigerated Beverage Dispenser, Newmarket - Water Coolers Equipment & Supplies
- Refrigerated Storage & Warehouse, Newmarket - Warehousing
- Refrigeration & Air Conditioning Contractors, Newmarket - Installation, Repair, Sales & Service
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- Refrigeration & Cooling Equipment, Parts & Supplies , Newmarket - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigerator & Freezer Equipment, Parts & Supplies, Newmarket
- Refrigerator Sales, Service & Repair, Newmarket - Fridge
- Refuse Collection & Disposal Services, Newmarket
- Rehabilitation Centers, Products & Services, Newmarket
- Rehabilitation Specialists, Newmarket
- Religious Organizations, Newmarket
- Religious Practitioners, Newmarket
- Rental & Leasing Business Equipment, Newmarket
- Repair Services, Newmarket
- Reprographic Services, Newmarket
- Research & Development Bureaus, Newmarket - Commercial, Economic, Sociological & Educational Research
- Research Services, Newmarket
- Residential, Newmarket
- Residential Apartments, Newmarket
- Residential Care Facilities, Newmarket
- Residential Construction Contractors, Newmarket - General Contractors
- Residential Lighting Fixtures Manufacturers, Newmarket
- Restaurant & Food Service Management Services, Newmarket
- Restaurant & Lounge, Bar, Or Pub, Newmarket
- Restaurants - Breakfast Brunch Lunch, Newmarket
- Restaurants/Food & Dining, Newmarket
- Retirement & Estate Planning, Newmarket
- Retirement Communities & Home, Assisted Living & Apartments, Newmarket
- Retirement Homes, Newmarket
- Retirement Planning Consultants & Services, Newmarket
- Riding & Rodeo Services, Newmarket
- Riding Apparel & Equipment, Newmarket
- Road Construction, Newmarket - Companies & Contractors
- Road Construction & Repair Contractors, Newmarket
- Robots & Robotics System, Newmarket
- Rodeo & Equestrian Equipment & Supplies, Newmarket
- Roofing Consultants, Newmarket - Roofing Companies
- Roofing Contractors, Newmarket - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Newmarket
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