- Radio Stations & Broadcasting Companies, Joppa
- Ready Mix Concrete, Joppa - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Joppa
- Real Estate, Joppa - Agent, Broker & Companies
- Real Estate Management, Joppa
- Real Estate Services, Joppa
- Recreational Equipment & Supplies Companies, Joppa
- Recycling Drop-Off Centers, Joppa
- Recycling Scrap & Waste Materials, Joppa - Scrap Metal, etc
- Refrigerator Sales, Service & Repair, Joppa - Fridge
- Refuse Collection & Disposal Services, Joppa
- Religious Organizations, Joppa
- Repair Services, Joppa
- Residential, Joppa
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- Residential Apartments, Joppa
- Residential Care Facilities, Joppa
- Residential Construction Contractors, Joppa - General Contractors
- Residential Landfills, Joppa
- Restaurant Equipment, Joppa
- Restaurant Equipment & Supplies, Joppa
- Restaurant Management & Consulting, Joppa - Food Facilities Consultants
- Restaurant Supplies & Equipment, Joppa
- Restaurants/Food & Dining, Joppa
- Rigging Service & Crane Hoisting, Joppa
- Roofing Consultants, Joppa - Roofing Companies
- Roofing Contractors, Joppa - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, Joppa
- RV Repair, Joppa - Recreational Vehicle
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