- Radio Communications Equipment & Systems , Northbrook
- Radio Stations & Broadcasting Companies, Northbrook
- Radiologists, Northbrook - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Northbrook - X-Ray Equipment & Supplies
- Radon Testing & Services, Northbrook
- Railroad, Northbrook - Commuter & Passenger Transport
- Real Estate, Northbrook - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Northbrook
- Real Estate Agent - Property Lessors, Northbrook
- Real Estate Appraiser, Northbrook - Appraisal Services
- Real Estate Appraisers & Consulting Services, Northbrook
- Real Estate Broker, Northbrook
- Real Estate Consultants, Northbrook
- Real Estate Developers, Northbrook
- Real Estate Management, Northbrook
- Real Estate Referral & Information Services, Northbrook
- Real Estate Services, Northbrook
- Real Estate Services Franchises, Northbrook
- Record Labels, Northbrook - Record Companies
- Record Storage, Destruction & Management, Northbrook
- Recorded And Or Live Announcements, Northbrook
- Recreational Services, Northbrook
- Recycling & Sanitation Consultants, Northbrook
- Recycling Drop-Off Centers, Northbrook
- Recycling Scrap & Waste Materials, Northbrook - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Northbrook
- Reform Synagogues, Northbrook
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- Refrigerated Beverage Dispenser, Northbrook - Water Coolers Equipment & Supplies
- Refrigeration & Cooling Equipment, Parts & Supplies , Northbrook - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigerator Sales, Service & Repair, Northbrook - Fridge
- Rehabilitation Centers, Products & Services, Northbrook
- Rehabilitation Specialists, Northbrook
- Rehabilitational Job Training Services, Northbrook
- Religious Organizations, Northbrook
- Rental Property Management, Northbrook
- Repair Services, Northbrook
- Research & Development Bureaus, Northbrook - Commercial, Economic, Sociological & Educational Research
- Research Services, Northbrook
- Residential, Northbrook
- Residential Apartments, Northbrook
- Residential Architect, Northbrook
- Residential Care Facilities, Northbrook
- Residential Construction Contractors, Northbrook - General Contractors
- Residential Real Estate Companies, Northbrook
- Resorts & Hotels, Northbrook
- Restaurant Equipment, Northbrook
- Restaurant Equipment & Supplies, Northbrook
- Restaurant Supplies & Equipment, Northbrook
- Restaurants/Food & Dining, Northbrook
- Retail Book Stores, Northbrook
- Retirement Communities & Home, Assisted Living & Apartments, Northbrook
- Roadside Assistance, Road Service & Towing Service, Northbrook
- Roofing Consultants, Northbrook - Roofing Companies
- Roofing Contractors, Northbrook - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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