- Radiator Coolant & Solvents, Thornton - Engine Coolant
- Radio & Television Repair Shops , Thornton - TV Repair
- Radiologists, Thornton - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Thornton - X-Ray Equipment & Supplies
- Radiotelephone Communications, Thornton
- Real Estate, Thornton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Thornton
- Real Estate Appraiser, Thornton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Thornton
- Real Estate Developers, Thornton
- Real Estate Services, Thornton
- Records, Tapes, CDs - Used & Vintage, Thornton
- Recreational Equipment Repair & Service, Thornton
- Recycling Drop-Off Centers, Thornton
- Red Wing Shoes, Thornton
- Reducing Exercise & Weight Control Services, Thornton
- Refrigeration & Cooling Equipment, Parts & Supplies , Thornton - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Thornton - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Thornton - Fridge
- Refuse Collection & Disposal, Thornton
- Refuse Systems & Garbage Disposal, Thornton
- Rehabilitation Centers, Products & Services, Thornton
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- Rehabilitation Specialists, Thornton
- Religious Education, Thornton
- Religious Goods & Church Supplies Stores, Thornton
- Religious Organizations, Thornton
- Rental & Leasing Business Equipment, Thornton
- Repair Services, Thornton
- Research Services, Thornton
- Residential, Thornton
- Residential Apartments, Thornton
- Residential Care Facilities, Thornton
- Residential Construction Contractors, Thornton - General Contractors
- Resorts & Hotels, Thornton
- Restaurant & Lounge, Bar, Or Pub, Thornton
- Restaurant Management & Consulting, Thornton - Food Facilities Consultants
- Restaurants - Breakfast Brunch Lunch, Thornton
- Restaurants/Food & Dining, Thornton
- Retail Book Stores, Thornton
- Retirement Communities & Home, Assisted Living & Apartments, Thornton
- Roofing Consultants, Thornton - Roofing Companies
- Roofing Contractors, Thornton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Thornton
- RV Repair, Thornton - Recreational Vehicle
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