- Racing Including Track Operations, Elkton
- Radio Stations & Broadcast Companies, Elkton - Radio, Television & Publishers Representatives
- Radon Testing & Services, Elkton
- Railroad Companies, Elkton
- Ready Mix Concrete, Elkton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Elkton
- Real Estate, Elkton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, Elkton
- Real Estate Appraiser, Elkton - Appraisal Services
- Real Estate Appraisers & Consulting Services, Elkton
- Real Estate Attorneys & Lawyers, Elkton
- Real Estate Consultants, Elkton
- Real Estate Developers, Elkton
- Real Estate Lawyers & Attorneys, Elkton
- Real Estate Management, Elkton
- Real Estate Services, Elkton
- Recreational Equipment & Supplies Companies, Elkton
- Recreational Equipment Repair & Service, Elkton
- Recreational Organizations, Elkton
- Recycling Drop-Off Centers, Elkton
- Recycling Scrap & Waste Materials, Elkton - Scrap Metal, etc
- Refrigerated Storage & Warehouse, Elkton - Warehousing
- Refrigeration & Cooling Equipment, Parts & Supplies , Elkton - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Elkton - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Elkton - Fridge
- Rehabilitation Centers, Products & Services, Elkton
- Rehabilitation Specialists, Elkton
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- Religious Education, Elkton
- Religious Organizations, Elkton
- Religious Practitioners, Elkton
- Rent To Own Furniture, Elkton
- Rental & Leasing Business Equipment, Elkton
- Repair Services, Elkton
- Research Services, Elkton
- Residential, Elkton
- Residential Apartments, Elkton
- Residential Care Facilities, Elkton
- Residential Construction Contractors, Elkton - General Contractors
- Restaurants - Breakfast Brunch Lunch, Elkton
- Restaurants/Food & Dining, Elkton
- Restoration Contractors, Elkton
- Retirement & Estate Planning, Elkton
- Retirement Communities & Home, Assisted Living & Apartments, Elkton
- Retirement Communities & Homes, Elkton
- Retirement Planning Consultants & Services, Elkton
- Riding & Rodeo Services, Elkton
- Rigging Service & Crane Hoisting, Elkton
- Road Construction, Elkton - Companies & Contractors
- Roofing Consultants, Elkton - Roofing Companies
- Roofing Contractors, Elkton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rubber Products - Retail, Elkton
- Rubbish Handling Equipment, Elkton - Garbage Containers
- Rv Parks, Elkton
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