- Race Car Dealers, Elkridge
- Racing Car Supplies, Elkridge
- Radiator Coolant & Solvents, Elkridge - Engine Coolant
- Radiator Repair, Elkridge - Gas Tank Repair
- Radio & Television Repair Shops , Elkridge - TV Repair
- Radio Stations & Broadcasting Companies, Elkridge
- Reading Instruction Schools, Elkridge
- Ready Mix Concrete, Elkridge - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Elkridge
- Real Estate, Elkridge - Agent, Broker & Companies
- Real Estate Agencies, Elkridge
- Real Estate Agent - Property Lessors, Elkridge
- Real Estate Developers, Elkridge
- Real Estate Management, Elkridge
- Real Estate Services, Elkridge
- Record Storage, Destruction & Management, Elkridge
- Recycling Drop-Off Centers, Elkridge
- Recycling Scrap & Waste Materials, Elkridge - Scrap Metal, etc
- Refrigeration & Air Conditioning Contractors, Elkridge - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Elkridge - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Elkridge - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Elkridge - Fridge
- Refuse Collection & Disposal Services, Elkridge
- Rehabilitation Centers, Products & Services, Elkridge
- Rehabilitation Specialists, Elkridge
- Religious Goods & Church Supplies Stores, Elkridge
- Religious Organizations, Elkridge
- Rental & Leasing Business Equipment, Elkridge
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- Rental Property Management, Elkridge
- Repair Services, Elkridge
- Repossession Services, Elkridge
- Research & Development Bureaus, Elkridge - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Elkridge - Laboratories
- Research Services, Elkridge
- Residential, Elkridge
- Residential Apartments, Elkridge
- Residential Architect, Elkridge
- Residential Care Facilities, Elkridge
- Residential Construction Contractors, Elkridge - General Contractors
- Resorts & Hotels, Elkridge
- Restaurant & Lounge, Bar, Or Pub, Elkridge
- Restaurant Equipment, Elkridge
- Restaurant Equipment & Supplies, Elkridge
- Restaurant Supplies & Equipment, Elkridge
- Restaurants - Breakfast Brunch Lunch, Elkridge
- Restaurants/Food & Dining, Elkridge
- Retail Book Stores, Elkridge
- Rigging Equipment & Supplies, Elkridge
- Road Construction, Elkridge - Companies & Contractors
- Road Construction & Repair Contractors, Elkridge
- Roofing Consultants, Elkridge - Roofing Companies
- Roofing Contractors, Elkridge - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Decks, Elkridge
- Rubber Products - Retail, Elkridge
- RV & Campers Repair & Service, Elkridge
- RV Repair, Elkridge - Recreational Vehicle
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