- Radon Testing & Services, East Hampton
- Real Estate, East Hampton - Agent, Broker & Companies
- Real Estate Agent - Property Lessors, East Hampton
- Real Estate Inspectors, East Hampton - Real Estate Inspection Service
- Real Estate Rentals, East Hampton
- Real Estate Services, East Hampton
- Recycling Drop-Off Centers, East Hampton
- Rehabilitation Centers, East Hampton
- Rehabilitation Specialists, East Hampton
- Religious Organizations, East Hampton
- Repair Services, East Hampton
- Research Services, East Hampton
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- Residential Care Facilities, East Hampton
- Residential Construction Contractors, East Hampton - General Contractors
- Resorts & Hotels, East Hampton
- Restaurants/Food & Dining, East Hampton
- Retirement Homes, East Hampton
- Rigging Equipment & Supplies, East Hampton
- Roofing Consultants, East Hampton - Roofing Companies
- Roofing Contractors, East Hampton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- RV & Campers Repair & Service, East Hampton
- Rv Parks, East Hampton
- RV Repair, East Hampton - Recreational Vehicle
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