- Racing Car Supplies, New Castle
- Racing Including Track Operations, New Castle
- Radiator Coolant & Solvents, New Castle - Engine Coolant
- Radio & Television Repair Shops , New Castle - TV Repair
- Radio Communications Equipment & Systems , New Castle
- Radio Stations & Broadcasting Companies, New Castle
- Reading Improvement Instruction Equipment & Supplies, New Castle
- Ready Mix Concrete, New Castle - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, New Castle
- Real Estate, New Castle - Agent, Broker & Companies
- Real Estate Appraiser, New Castle - Appraisal Services
- Real Estate Appraisers & Consulting Services, New Castle
- Real Estate Developers, New Castle
- Real Estate Listings Services, New Castle
- Real Estate Management, New Castle
- Real Estate Services, New Castle
- Record Storage, Destruction & Management, New Castle
- Recording Studio - Equipment & Rental, New Castle
- Recreational Equipment Repair & Service, New Castle
- Recycling Drop-Off Centers, New Castle
- Recycling Scrap & Waste Materials, New Castle - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, New Castle
- Refrigerated Storage & Warehouse, New Castle - Warehousing
- Refrigeration & Air Conditioning Contractors, New Castle - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , New Castle - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, New Castle - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, New Castle
- Refrigerator Sales, Service & Repair, New Castle - Fridge
- Refuse Systems & Garbage Disposal, New Castle
- Rehabilitation Centers, New Castle
- Rehabilitation Centers, Products & Services, New Castle
- Rehabilitation Specialists, New Castle
- Rehabilitational Job Training Services, New Castle
- Religious Organizations, New Castle
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- Religious Practitioners, New Castle
- Religious Services, New Castle
- Rental & Leasing Business Equipment, New Castle
- Repair Services, New Castle
- Repossession Services, New Castle
- Research & Development Labs, New Castle - Laboratories
- Research Services, New Castle
- Residential, New Castle
- Residential Apartments, New Castle
- Residential Care Facilities, New Castle
- Residential Construction Contractors, New Castle - General Contractors
- Restaurant Equipment, New Castle
- Restaurant Equipment & Supplies, New Castle
- Restaurant Equipment Cleaning, New Castle - Restaurant Cleaners
- Restaurant Equipment Repair & Service, New Castle - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, New Castle - Food Facilities Consultants
- Restaurant Supplies & Equipment, New Castle
- Restaurants/Food & Dining, New Castle
- Retail Book Stores, New Castle
- Riding Equipment, New Castle
- Rifle & Pistol Ranges, New Castle
- Road Construction, New Castle - Companies & Contractors
- Road Construction Equipment & Machinery, New Castle
- Roadside Assistance, Road Service & Towing Service, New Castle
- Rodeo & Equestrian Equipment & Supplies, New Castle
- Rollers Wooden Metal Rubber Plastic Etcetera, New Castle
- Roofing Consultants, New Castle - Roofing Companies
- Roofing Contractors, New Castle - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, New Castle
- Rubber Products - Retail, New Castle
- RV & Campers Repair & Service, New Castle
- Rv Parks, New Castle
- RV Repair, New Castle - Recreational Vehicle
- Ryder Truck Rental , New Castle - Ryder Moving
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