- Radiator Coolant & Solvents, Oxon Hill - Engine Coolant
- Radio Stations & Broadcasting Companies, Oxon Hill
- Radiologists, Oxon Hill - Radiology Doctors, Physicians & Surgeons
- Real Estate, Oxon Hill - Agent, Broker & Companies
- Real Estate Management, Oxon Hill
- Real Estate Services, Oxon Hill
- Recording Studio - Equipment & Rental, Oxon Hill
- Recording Studio Service - Sound & Video, Oxon Hill
- Recreational Services, Oxon Hill
- Reducing Exercise & Weight Control Services, Oxon Hill
- Refrigeration Repair & Service, Oxon Hill - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Oxon Hill - Fridge
- Refuse Collection & Disposal Services, Oxon Hill
- Religious Organizations, Oxon Hill
- Religious Practitioners, Oxon Hill
- Rental & Leasing Business Equipment, Oxon Hill
- Repair Services, Oxon Hill
- Research & Development Labs, Oxon Hill - Laboratories
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- Research Services, Oxon Hill
- Residential, Oxon Hill
- Residential Apartments, Oxon Hill
- Residential Construction Contractors, Oxon Hill - General Contractors
- Residential Electricians, Oxon Hill - Electric Contractors
- Resorts & Hotels, Oxon Hill
- Restaurant & Lounge, Bar, Or Pub, Oxon Hill
- Restaurant Equipment, Oxon Hill
- Restaurant Equipment & Supplies, Oxon Hill
- Restaurant Equipment Repair & Service, Oxon Hill - Bakery, Beverage, Food & Soda Fountain Equipment
- Restaurant Management & Consulting, Oxon Hill - Food Facilities Consultants
- Restaurant Supplies & Equipment, Oxon Hill
- Restaurants/Food & Dining, Oxon Hill
- Restoration Church, Oxon Hill
- Roadside Assistance, Road Service & Towing Service, Oxon Hill
- Roof Repair, Oxon Hill - Roofing Repair Services
- Roofing Consultants, Oxon Hill - Roofing Companies
- Roofing Contractors, Oxon Hill - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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