- Radiator Coolant & Solvents, Southold - Engine Coolant
- Radiator Repair, Southold - Gas Tank Repair
- Radio & Tv Communications Equipment Manufacturers, Southold
- Real Estate, Southold - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Southold
- Real Estate Appraiser, Southold - Appraisal Services
- Real Estate Appraisers & Consulting Services, Southold
- Real Estate Broker, Southold
- Real Estate Consultants, Southold
- Real Estate Developers, Southold
- Real Estate Rentals, Southold
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- Real Estate Services, Southold
- Religious Organizations, Southold
- Repair Services, Southold
- Residential, Southold
- Residential Apartments, Southold
- Residential Construction Contractors, Southold - General Contractors
- Restaurants - Breakfast Brunch Lunch, Southold
- Restaurants/Food & Dining, Southold
- Retirement Communities & Home, Assisted Living & Apartments, Southold
- Riding & Rodeo Services, Southold
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