- Racing Including Track Operations, White Marsh
- Radio & Television Repair Shops , White Marsh - TV Repair
- Real Estate, White Marsh - Agent, Broker & Companies
- Real Estate Services, White Marsh
- Recording Studio - Equipment & Rental, White Marsh
- Recycling Scrap & Waste Materials, White Marsh - Scrap Metal, etc
- Refrigeration & Air Conditioning Contractors, White Marsh - Installation, Repair, Sales & Service
- Religious Organizations, White Marsh
- Repair Services, White Marsh
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- Residential Construction Contractors, White Marsh - General Contractors
- Restaurants/Food & Dining, White Marsh
- Retirement Communities & Home, Assisted Living & Apartments, White Marsh
- Roofing & Siding Materials, Equipments & Supplies, White Marsh - Wholesale, Manufacturers & Suppliers
- Roofing Consultants, White Marsh - Roofing Companies
- Roofing Contractors, White Marsh - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, White Marsh
- RV Repair, White Marsh - Recreational Vehicle
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