- Radiator Coolant & Solvents, Hyattsville - Engine Coolant
- Radiator Repair, Hyattsville - Gas Tank Repair
- Radio & Television Repair Shops , Hyattsville - TV Repair
- Radio Stations & Broadcasting Companies, Hyattsville
- Radiology Equipment & Services, Hyattsville - X-Ray Equipment & Supplies
- Radiotelephone Communications, Hyattsville
- Railroad Services, Hyattsville
- Range & Oven Repair, Service & Sales, Hyattsville
- Rape Victim Services, Hyattsville
- Real Estate, Hyattsville - Agent, Broker & Companies
- Real Estate & Insurance Schools, Hyattsville
- Real Estate Agent - Property Lessors, Hyattsville
- Real Estate Developers, Hyattsville
- Real Estate Management, Hyattsville
- Real Estate Rentals, Hyattsville
- Real Estate Services, Hyattsville
- Real Estate Services Franchises, Hyattsville
- Record Storage, Destruction & Management, Hyattsville
- Recording Studio - Equipment & Rental, Hyattsville
- Recording Studio Service - Sound & Video, Hyattsville
- Records, Tapes, Cd & Dvd Manufacturers, Hyattsville
- Records, Tapes, CDs - Used & Vintage, Hyattsville
- Records, Tapes, Compact Discs Wholesale, Hyattsville
- Recreational Equipment Repair & Service, Hyattsville
- Recreational Services, Hyattsville
- Recycled Concrete & Asphalt (Aggregate), Hyattsville
- Recycling Drop-Off Centers, Hyattsville
- Recycling Scrap & Waste Materials, Hyattsville - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Hyattsville
- Refrigeration & Cooling Equipment, Parts & Supplies , Hyattsville - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Hyattsville - Ac, Freezer, Refrigerator Repair
- Refrigerator & Freezer Equipment, Parts & Supplies, Hyattsville
- Refrigerator Sales, Service & Repair, Hyattsville - Fridge
- Refuse Collection & Disposal Services, Hyattsville
- Refuse Systems & Garbage Disposal, Hyattsville
- Rehabilitation Centers, Products & Services, Hyattsville
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- Rehabilitation Specialists, Hyattsville
- Rehabilitational Job Training Services, Hyattsville
- Religious Apparel & Vestments, Hyattsville
- Religious Education, Hyattsville
- Religious Goods & Church Supplies Stores, Hyattsville
- Religious Organizations, Hyattsville
- Religious Practitioners, Hyattsville
- Religious Services, Hyattsville
- Rental & Leasing Business Equipment, Hyattsville
- Rental Services, Hyattsville
- Repair Services, Hyattsville
- Repossession Services, Hyattsville
- Research & Development Labs, Hyattsville - Laboratories
- Research Services, Hyattsville
- Residential, Hyattsville
- Residential Apartments, Hyattsville
- Residential Care Facilities, Hyattsville
- Residential Construction Contractors, Hyattsville - General Contractors
- Restaurant & Food Service Management Services, Hyattsville
- Restaurant Equipment, Hyattsville
- Restaurant Equipment & Supplies, Hyattsville
- Restaurant Supplies & Equipment, Hyattsville
- Restaurants/Food & Dining, Hyattsville
- Restoration Church, Hyattsville
- Restoration Contractors, Hyattsville
- Retail Book Stores, Hyattsville
- Retirement Communities & Home, Assisted Living & Apartments, Hyattsville
- Rigging Equipment & Supplies, Hyattsville
- Road Construction, Hyattsville - Companies & Contractors
- Road Construction & Repair Contractors, Hyattsville
- Roadside Assistance, Road Service & Towing Service, Hyattsville
- Roof Repair, Hyattsville - Roofing Repair Services
- Roofing Consultants, Hyattsville - Roofing Companies
- Roofing Contractors, Hyattsville - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Hyattsville
- Ryder Truck Rental , Hyattsville - Ryder Moving
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