- Racing Car Supplies, Rockville Centre
- Rackets Restringing & Repair, Rockville Centre
- Racquetball Courts, Rockville Centre
- Radio & Television Repair Shops , Rockville Centre - TV Repair
- Railroad Companies, Rockville Centre
- Real Estate, Rockville Centre - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Rockville Centre
- Real Estate Agent - Property Lessors, Rockville Centre
- Real Estate Appraiser, Rockville Centre - Appraisal Services
- Real Estate Appraisers & Consulting Services, Rockville Centre
- Real Estate Broker, Rockville Centre
- Real Estate Consultants, Rockville Centre
- Real Estate Management, Rockville Centre
- Real Estate Rentals, Rockville Centre
- Real Estate Services, Rockville Centre
- Real Estate Services Franchises, Rockville Centre
- Recording Studio Service - Sound & Video, Rockville Centre
- Records, Tapes, CDs - Used & Vintage, Rockville Centre
- Recreational Equipment Repair & Service, Rockville Centre
- Recycling Drop-Off Centers, Rockville Centre
- Recycling Scrap & Waste Materials, Rockville Centre - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Rockville Centre
- Rehabilitation Centers, Products & Services, Rockville Centre
- Rehabilitation Specialists, Rockville Centre
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- Religious Apparel & Vestments, Rockville Centre
- Religious Goods & Church Supplies Stores, Rockville Centre
- Religious Organizations, Rockville Centre
- Rental & Leasing Business Equipment, Rockville Centre
- Rental Property Management, Rockville Centre
- Repair Services, Rockville Centre
- Research & Development Bureaus, Rockville Centre - Commercial, Economic, Sociological & Educational Research
- Research Services, Rockville Centre
- Residential, Rockville Centre
- Residential Apartments, Rockville Centre
- Residential Care Facilities, Rockville Centre
- Residential Construction Contractors, Rockville Centre - General Contractors
- Resorts & Hotels, Rockville Centre
- Restaurant & Lounge, Bar, Or Pub, Rockville Centre
- Restaurant Equipment, Rockville Centre
- Restaurant Equipment & Supplies, Rockville Centre
- Restaurant Supplies & Equipment, Rockville Centre
- Restaurants/Food & Dining, Rockville Centre
- Retirement Communities & Home, Assisted Living & Apartments, Rockville Centre
- Retirement Home Referral Service, Rockville Centre - Nursing Home & Care Facilities Referrals & Information
- Rheumatologists, Rockville Centre - Rheumatology Doctors, Physicians & Surgeons
- Risk Management Consultants, Rockville Centre
- Roofing Consultants, Rockville Centre - Roofing Companies
- Roofing Contractors, Rockville Centre - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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