- Radio & Television Repair Shops , Lanham - TV Repair
- Radio Stations & Broadcasting Companies, Lanham
- Radiologists, Lanham - Radiology Doctors, Physicians & Surgeons
- Range & Oven Repair, Service & Sales, Lanham
- Real Estate, Lanham - Agent, Broker & Companies
- Real Estate & Insurance Schools, Lanham
- Real Estate Agent - Property Lessors, Lanham
- Real Estate Appraisers & Consulting Services, Lanham
- Real Estate Consultants, Lanham
- Real Estate Developers, Lanham
- Real Estate Management, Lanham
- Real Estate Services, Lanham
- Real Estate Staging Service, Lanham
- Record Storage, Destruction & Management, Lanham
- Recreational Services, Lanham
- Red Wing Shoes, Lanham
- Reformed Churches, Lanham
- Refrigeration & Cooling Equipment, Parts & Supplies , Lanham - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Lanham - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Lanham
- Refrigerator Sales, Service & Repair, Lanham - Fridge
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- Rehabilitation Centers, Products & Services, Lanham
- Rehabilitation Specialists, Lanham
- Rehabilitational Job Training Services, Lanham
- Religious Organizations, Lanham
- Religious Services, Lanham
- Rental & Leasing Business Equipment, Lanham
- Rental Property Management, Lanham
- Repair Services, Lanham
- Research & Development Bureaus, Lanham - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Lanham - Laboratories
- Research Services, Lanham
- Residential, Lanham
- Residential Apartments, Lanham
- Residential Care Facilities, Lanham
- Residential Construction Contractors, Lanham - General Contractors
- Resource Centers, Lanham
- Restaurant Management & Consulting, Lanham - Food Facilities Consultants
- Restaurants/Food & Dining, Lanham
- Retirement Communities & Home, Assisted Living & Apartments, Lanham
- Roofing Consultants, Lanham - Roofing Companies
- Roofing Contractors, Lanham - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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