- Radio & Television Repair Shops , Dundalk - TV Repair
- Radio Stations & Broadcasting Companies, Dundalk
- Radiologists, Dundalk - Radiology Doctors, Physicians & Surgeons
- Radiotelephone Communications, Dundalk
- Radon Testing & Services, Dundalk
- Railroad & Subway Construction Contractors, Dundalk
- Railroad Companies, Dundalk
- Railroad Contractors, Dundalk
- Real Estate, Dundalk - Agent, Broker & Companies
- Real Estate Developers, Dundalk
- Real Estate Management, Dundalk
- Real Estate Services, Dundalk
- Record Storage, Destruction & Management, Dundalk
- Recycling Drop-Off Centers, Dundalk
- Recycling Scrap & Waste Materials, Dundalk - Scrap Metal, etc
- Red Wing Shoes, Dundalk
- Reducing Exercise & Weight Control Services, Dundalk
- Refrigeration & Cooling Equipment, Parts & Supplies , Dundalk - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Dundalk - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Dundalk - Fridge
- Refuse Collection & Disposal, Dundalk
- Refuse Systems & Garbage Disposal, Dundalk
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- Religious Organizations, Dundalk
- Religious Practitioners, Dundalk
- Rent To Own Furniture, Dundalk
- Rental & Leasing Business Equipment, Dundalk
- Rental Property Management, Dundalk
- Repair Services, Dundalk
- Research Services, Dundalk
- Residential, Dundalk
- Residential Apartments, Dundalk
- Residential Care Facilities, Dundalk
- Residential Construction Contractors, Dundalk - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Dundalk
- Restaurants/Food & Dining, Dundalk
- Restoration Church, Dundalk
- Retirement Communities & Home, Assisted Living & Apartments, Dundalk
- Rigging Service & Crane Hoisting, Dundalk
- Road Construction, Dundalk - Companies & Contractors
- Road Construction & Repair Contractors, Dundalk
- Rollers Wooden Metal Rubber Plastic Etcetera, Dundalk
- Roofing Consultants, Dundalk - Roofing Companies
- Roofing Contractors, Dundalk - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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