- Radio & Tv Communications Equipment Manufacturers, Northport
- Range & Oven Repair, Service & Sales, Northport
- Real Estate, Northport - Agent, Broker & Companies
- Real Estate Agencies, Northport
- Real Estate Agent - Property Lessors, Northport
- Real Estate Appraiser, Northport - Appraisal Services
- Real Estate Appraisers & Consulting Services, Northport
- Real Estate Management, Northport
- Real Estate Services, Northport
- Record Labels, Northport - Record Companies
- Reducing Exercise & Weight Control Services, Northport
- Refrigeration & Air Conditioning Contractors, Northport - Installation, Repair, Sales & Service
- Refrigerator Sales, Service & Repair, Northport - Fridge
- Religious Organizations, Northport
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- Relocation Services, Northport
- Repair Services, Northport
- Research Services, Northport
- Residential Care Facilities, Northport
- Residential Construction Contractors, Northport - General Contractors
- Restaurant Architects, Northport
- Restaurant Information & Referral Service, Northport
- Restaurants/Food & Dining, Northport
- Retirement & Estate Planning, Northport
- Retirement Planning Consultants & Services, Northport
- Retirement Planning Services, Northport
- Roofing Consultants, Northport - Roofing Companies
- Roofing Contractors, Northport - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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