- Radio & Television Repair Shops , Smithtown - TV Repair
- Radiologists, Smithtown - Radiology Doctors, Physicians & Surgeons
- Radiology Equipment & Services, Smithtown - X-Ray Equipment & Supplies
- Radiotelephone Communications, Smithtown
- Ready Mix Concrete, Smithtown - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Smithtown
- Real Estate, Smithtown - Agent, Broker & Companies
- Real Estate Attorneys & Lawyers, Smithtown
- Real Estate Developers, Smithtown
- Real Estate Investment Trusts, Smithtown
- Real Estate Management, Smithtown
- Real Estate Services, Smithtown
- Recording Studio Service - Sound & Video, Smithtown
- Reducing Exercise & Weight Control Services, Smithtown
- Rehabilitation Centers, Products & Services, Smithtown
- Rehabilitation Specialists, Smithtown
- Religious Apparel & Vestments, Smithtown
- Religious Counseling, Smithtown
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- Religious Goods & Church Supplies Stores, Smithtown
- Religious Organizations, Smithtown
- Religious Services, Smithtown
- Repair Services, Smithtown
- Research & Development Bureaus, Smithtown - Commercial, Economic, Sociological & Educational Research
- Research Services, Smithtown
- Residential, Smithtown
- Residential Apartments, Smithtown
- Residential Care Facilities, Smithtown
- Residential Construction Contractors, Smithtown - General Contractors
- Resorts & Hotels, Smithtown
- Restaurants/Food & Dining, Smithtown
- Retirement Communities & Home, Assisted Living & Apartments, Smithtown
- Retirement Home Referral Service, Smithtown - Nursing Home & Care Facilities Referrals & Information
- Retirement Homes, Smithtown
- Risk Management Consultants, Smithtown
- Roofing Consultants, Smithtown - Roofing Companies
- Roofing Contractors, Smithtown - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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