Racing Car Equipment (Automobile Parts and Supplies New)
Racing Car Equipment (Automobile Parts and Supplies Used and Rebuilt)
Racing Car Equipment (Automobile Performance, Racing and Sports Car Equipment)
Racing Car Memorabilia (Collectibles)
Racing Car Memorabilia (Hobby and Model Shops)
Racing (Including Track Operation)
Communications 
Radiant Heating Systems (Electric Heating Equipment and Systems)
Radiant Heating Systems (Heating Contractors)
Radiators Heating (Heating Equipment)
Radio and Television Repair Shops
Radio Broadcasting Schools (Broadcasting Schools)
Radio Broadcasting Stations (Radio Stations and Broadcasting Companies)
Radio Communications Companies (Radiotelephone Communications - Equipment and Systems)
Radio Communications Companies (Telegraph Service)
Radio Dealers Automobile (Automobile Radios and Stereos Sales and Repair)
Radio Dealers (Television and Radio Dealers)
Radio Paging and Signaling Common Carrier (Paging and Signaling Service Private Systems)
Radio Service and Repair (Television and Radio Service and Repair)
Radio Station Representatives (Advertising Radio)
Radiotelephone Communications Equipment and Systems
Radiotelephone Communications Equipment and Systems (Mobile Telephone Equipment and Supplies)
Radiotherapy (Hospitals)
Radio and Television Broadcasting Equipment
Radio and Television Publishers 
Radiology (Physicians and Surgeons)
Representatives
Radio Broadcasting Stations
Radio, Television and Electronics Stores
Rags (Wiping Cloths)
Railroad Equipment
Railroad Equipment Model (Hobby and Model Shops)
Railroad Equipment Model (Hobby and Model Supplies Wholesale and Manufacturers)
Railroad Stations (Railroads)
Railroad Lines (Haul Operating)
Ranges and Ovens Parts and Supplies (Ranges and Ovens Supplies and Parts)
Rape Victim Service (Crime Victim Services)
Rape Victim Service (Crisis Intervention Services)
Rappelling Equipment (Mountain Climbing Equipment)
Rat Poison (Pest Control Supplies and Equipment)
Ready Mixed Concrete (Concrete Ready Mixed)
Ready Mixed Concrete Manufacturers
Real Estate (Attorneys)
Real Estate Agents and Managers
Real Estate Appraisers
Real Estate Appraisers (Appraisers)
Real Estate Inspection Service (Building Inspection)
Real Estate Inspection Service (Home Inspection Service)
Real Estate Investments (Investment Securities)
Real Estate Investments (Investments Real Estate)
Real Estate Investment Trusts
Real Estate Loans (Banks)
Real Estate Loans (Savings and Loan Associations)

Regulation of Miscellaneous Commercial Sectors
Relays and Industrial Controls
Religious Organizations
Repair Shops and Related Services
Rescue Equipment (Mountain Climbing Equipment)
Research Consultants (Economic Research and Analysis)
Research Consultants (Market Research and Analysis)
Residential Care
Residential Electric Lighting Fixtures
Resorts Skiing (Skiing Center, Clubs and Resorts)
Resuscitators and Inhalators (Hospital Equipment and Supplies)
Retail Bakeries
Retail Nurseries and Lawn Supply Stores
Retirement Homes (Retirement and Life Care Communities and Homes)
Re-Upholstery and Furniture Repair
Rheumatology (Physicians and Surgeons)
Riding Academies
Riding Academies (Stables)
Right Of Way Acquisition Contractors (Land Clearing and Leveling)
Road Boring (Drilling and Boring Contractors)
Road Resurfacing (Paving Contractors)
Road Service Automotive
Road Service Automotive (Towing Automotive)
Robes (Caps and Gowns)
Robes (Children's and Infants' Wear Wholesale and Manufacturers)
Robes (Children's and Infants' Wear)
Robes (Church Supplies and Services)
Robes (Men's Clothing and Furnishings Wholesale and Manufacturers)
Robes (Men's Clothing and Furnishings)
Robes (Women's Apparel Wholesale and Manufacturers)
Robes (Women's Apparel)
Rock (Stone Natural)
Rolling and Drawing Of Nonferrous Metals
Rolling Mill Machinery and Equipment
Roof Cleaning (Roof Maintenance and Cleaning)
Roof Consultants (Building Construction Consultants)
Roof Consultants (Roof Contractors)
Roof Consultants (Roof Structures)
Roof Consultants (Roofing Service Consultants)
Roofing, Siding and Insulation Materials
Roofing, Siding and Sheet Metal Work
Rooming and Boarding Houses (Student Housing)
Rubber and Plastic Hose and Belting
Rubber Foam and Sponge (Foam and Sponge Rubber)
Rubbish Dumps (Landfills)
Rug Cleaning, Dyeing and Repair (Carpet and Rug Cleaners)
Rug Cleaning, Dyeing and Repair (Carpet and Rug Dyeing)
Rug Cleaning, Dyeing and Repair (Carpet and Rug Repair)
Rug Dealers (Carpet and Rug Dealers New)
Rug Dealers (Carpet and Rug Dealers Used)
Rugs Oriental (Carpet and Rug Dealers New)
Rugs Oriental (Carpet and Rug Dealers Used)
Runaway Youth Services (Social Service Organizations)
Running Associations (Athletic Organizations)