- Railroad Companies, Littleton
- Ready Mix Concrete, Littleton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Littleton
- Real Estate, Littleton - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Littleton
- Real Estate Agent - Property Lessors, Littleton
- Real Estate Broker, Littleton
- Real Estate Management, Littleton
- Real Estate Services, Littleton
- Records, Tapes, CDs - Used & Vintage, Littleton
- Refrigerator Sales, Service & Repair, Littleton - Fridge
- Refuse Collection & Disposal Services, Littleton
- Religious Organizations, Littleton
- Repair Services, Littleton
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- Research Services, Littleton
- Residential, Littleton
- Residential Apartments, Littleton
- Residential Care Facilities, Littleton
- Residential Construction Contractors, Littleton - General Contractors
- Restaurants/Food & Dining, Littleton
- Retirement Communities & Home, Assisted Living & Apartments, Littleton
- Riding & Rodeo Services, Littleton
- Roadside Assistance, Road Service & Towing Service, Littleton
- Rodeo & Equestrian Equipment & Supplies, Littleton
- Roofing Consultants, Littleton - Roofing Companies
- Roofing Contractors, Littleton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Littleton
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