- Race Car Dealers, Schaumburg
- Racing Car Supplies, Schaumburg
- Racing Including Track Operations, Schaumburg
- Radiator Coolant & Solvents, Schaumburg - Engine Coolant
- Radiator Repair, Schaumburg - Gas Tank Repair
- Radio & Television Repair Shops , Schaumburg - TV Repair
- Radio Broadcasting Consultants, Schaumburg
- Radio Communications Equipment & Systems , Schaumburg
- Radio Station Equipment & Systems, Schaumburg
- Radio Stations & Broadcasting Companies, Schaumburg
- Radiologists, Schaumburg - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Schaumburg - X-Ray Equipment & Supplies
- Radiotelephone Communications, Schaumburg
- Radon Testing & Services, Schaumburg
- Railroad, Schaumburg - Commuter & Passenger Transport
- Real Estate, Schaumburg - Agent, Broker & Companies
- Real Estate & Property Brokers, Schaumburg
- Real Estate Agent & Broker Services, Schaumburg
- Real Estate Agent - Property Lessors, Schaumburg
- Real Estate Appraiser, Schaumburg - Appraisal Services
- Real Estate Appraisers & Consulting Services, Schaumburg
- Real Estate Attorneys & Lawyers, Schaumburg
- Real Estate Attorneys & Lawyers, Schaumburg
- Real Estate Broker, Schaumburg
- Real Estate Developers, Schaumburg
- Real Estate Lawyers & Attorneys, Schaumburg
- Real Estate Management, Schaumburg
- Real Estate Rentals, Schaumburg
- Real Estate Services, Schaumburg
- Real Estate Services Franchises, Schaumburg
- Record Destruction Service, Schaumburg
- Record Storage, Destruction & Management, Schaumburg
- Recording Studio Service - Sound & Video, Schaumburg
- Records, Tapes, CDs - Used & Vintage, Schaumburg
- Recreation Management Services, Schaumburg
- Recreational Services, Schaumburg
- Recycling Drop-Off Centers, Schaumburg
- Recycling Scrap & Waste Materials, Schaumburg - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Schaumburg
- Reflexologists, Schaumburg
- Refrigeration & Cooling Equipment, Parts & Supplies , Schaumburg - Water Cooler, Ice Machine, Beverage Dispenser, etc
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- Refrigeration Repair & Service, Schaumburg - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Schaumburg - Fridge
- Refuse Collection & Disposal Services, Schaumburg
- Refuse Systems & Garbage Disposal, Schaumburg
- Rehabilitation Centers, Products & Services, Schaumburg
- Rehabilitation Specialists, Schaumburg
- Religious Goods & Church Supplies Stores, Schaumburg
- Religious Organizations, Schaumburg
- Religious Practitioners, Schaumburg
- Rental & Leasing Business Equipment, Schaumburg
- Rental Property Management, Schaumburg
- Repair Services, Schaumburg
- Research & Development Bureaus, Schaumburg - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Schaumburg - Laboratories
- Research Film Laboratories & Film Services Motion Pictures, Schaumburg
- Research Services, Schaumburg
- Residential, Schaumburg
- Residential Apartments, Schaumburg
- Residential Architect, Schaumburg
- Residential Care Facilities, Schaumburg
- Residential Construction Contractors, Schaumburg - General Contractors
- Resorts & Hotels, Schaumburg
- Restaurant & Lounge, Bar, Or Pub, Schaumburg
- Restaurant Equipment Repair & Service, Schaumburg - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Lobster, Schaumburg
- Restaurant Management & Consulting, Schaumburg - Food Facilities Consultants
- Restaurants/Food & Dining, Schaumburg
- Resume Service, Schaumburg
- Retail Book Stores, Schaumburg
- Retirement Communities & Home, Assisted Living & Apartments, Schaumburg
- Retirement Homes, Schaumburg
- Rheem / Rudd Heating & Air Conditioning Contractors, Schaumburg - Air Conditioner Contractors & Systems
- Rheumatologists, Schaumburg - Rheumatology Doctors, Physicians & Surgeons
- Risk Management Consultants, Schaumburg
- Road Construction, Schaumburg - Companies & Contractors
- Road Construction & Repair Contractors, Schaumburg
- Roadside Assistance, Road Service & Towing Service, Schaumburg
- Robots & Robotics System, Schaumburg
- Roofing Consultants, Schaumburg - Roofing Companies
- Roofing Contractors, Schaumburg - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Schaumburg
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