- Racing Car Supplies, Alton
- Racing Including Track Operations, Alton
- Radio & Television Repair Shops , Alton - TV Repair
- Radio Broadcasting Consultants, Alton
- Radio Communications Equipment & Systems , Alton
- Radio Stations & Broadcasting Companies, Alton
- Radiologists, Alton - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Alton
- Rail Line Travel Agents & Agencies, Alton
- Railroad Companies, Alton
- Ready Mix Concrete, Alton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Alton
- Real Estate, Alton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Alton
- Real Estate Appraiser, Alton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Alton
- Real Estate Developers, Alton
- Real Estate Management, Alton
- Real Estate Services, Alton
- Recreational Services, Alton
- Recycling Drop-Off Centers, Alton
- Recycling Scrap & Waste Materials, Alton - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Alton
- Reform Synagogues, Alton
- Rehabilitation Centers, Products & Services, Alton
- Rehabilitation Specialists, Alton
- Rehabilitational Job Training Services, Alton
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- Relief Organizations, Alton
- Religious Education, Alton
- Religious Goods & Church Supplies Stores, Alton
- Religious Organizations, Alton
- Rental & Leasing Business Equipment, Alton
- Repair Services, Alton
- Research Services, Alton
- Residential, Alton
- Residential Apartments, Alton
- Residential Care Facilities, Alton
- Residential Construction Contractors, Alton - General Contractors
- Restaurant Equipment, Alton
- Restaurant Equipment & Supplies, Alton
- Restaurant Supplies & Equipment, Alton
- Restaurants - Breakfast Brunch Lunch, Alton
- Restaurants/Food & Dining, Alton
- Retail Book Stores, Alton
- Retaining Wall Contractors, Alton - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement Communities & Home, Assisted Living & Apartments, Alton
- Retirement Home Referral Service, Alton - Nursing Home & Care Facilities Referrals & Information
- Rheumatologists, Alton - Rheumatology Doctors, Physicians & Surgeons
- Rifle & Pistol Ranges, Alton
- Road Construction, Alton - Companies & Contractors
- Road Construction & Repair Contractors, Alton
- Roofing Consultants, Alton - Roofing Companies
- Roofing Contractors, Alton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Alton
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