- Racing Car Supplies, Colton
- Radiator Coolant & Solvents, Colton - Engine Coolant
- Radiator Repair, Colton - Gas Tank Repair
- Radiator Repair & Rebuild, Colton
- Radio Stations & Broadcasting Companies, Colton
- Railroad, Colton - Commuter & Passenger Transport
- Ready Mix Concrete, Colton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Colton
- Real Estate, Colton - Agent, Broker & Companies
- Real Estate Agencies, Colton
- Real Estate Agent - Property Lessors, Colton
- Real Estate Appraiser, Colton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Colton
- Real Estate Developers, Colton
- Real Estate Management, Colton
- Real Estate Services, Colton
- Recording Studio - Equipment & Rental, Colton
- Recording Studio Service - Sound & Video, Colton
- Recycling Drop-Off Centers, Colton
- Recycling Scrap & Waste Materials, Colton - Scrap Metal, etc
- Refrigerated Beverage Dispenser, Colton - Water Coolers Equipment & Supplies
- Refrigerated Storage & Warehouse, Colton - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Colton - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Colton - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Colton - Fridge
- Refuse Collection & Disposal Services, Colton
- Refuse Systems & Garbage Disposal, Colton
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- Rehabilitation Centers, Products & Services, Colton
- Rehabilitation Specialists, Colton
- Religious Goods & Church Supplies Stores, Colton
- Religious Organizations, Colton
- Religious Practitioners, Colton
- Rental & Leasing Business Equipment, Colton
- Repair Services, Colton
- Reprographic Services, Colton
- Research Services, Colton
- Residential, Colton
- Residential Apartments, Colton
- Residential Care Facilities, Colton
- Residential Landfills, Colton
- Resorts & Hotels, Colton
- Resource Consultants, Colton
- Restaurant Equipment, Colton
- Restaurant Equipment & Supplies, Colton
- Restaurant Equipment & Supplies Manufacturers, Colton
- Restaurant Supplies & Equipment, Colton
- Restaurants - Breakfast Brunch Lunch, Colton
- Restaurants/Food & Dining, Colton
- Resume Service, Colton
- Rigging Service & Crane Hoisting, Colton
- Roadside Assistance, Road Service & Towing Service, Colton
- Roofing Consultants, Colton - Roofing Companies
- Roofing Contractors, Colton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rooming & Boarding Houses, Colton
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