- Safe & Vault, Rockville Centre
- Safe, Lock & Key Repair Services, Rockville Centre - Safes & Vaults Opening & Repair
- Safety & Security Systems & Consultants, Rockville Centre
- Sales & Marketing Consultant, Rockville Centre
- Sandwich Shop Restaurants, Rockville Centre
- Savings & Loan Associations Representatives, Rockville Centre
- Savings & Loans Institutions, Rockville Centre
- Savings Banks, Rockville Centre
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Rockville Centre
- Scientific & Laboratory Equipment & Instruments, Rockville Centre
- Scientific Services, Rockville Centre
- Scrap & Waste Materials, Rockville Centre
- Screen Printing, Rockville Centre
- Seafood Restaurants, Rockville Centre
- Secondary Schools, Rockville Centre
- Secretarial & Court Reporting Services, Rockville Centre
- Security & Commodity Brokers, Rockville Centre
- Security & Surveillance System & Equipment, Rockville Centre
- Security Alarm Systems - Home & Business, Rockville Centre
- Security Brokers & Dealers, Rockville Centre
- Security Control Systems & Monitoring, Rockville Centre - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Rockville Centre
- Security Management Consultants, Rockville Centre
- Security Services, Rockville Centre
- Senior Citizens Service & Health Organizations, Rockville Centre
- Service Establishment Supplies & Equipment, Rockville Centre
- Sewer & Drain Cleaning & Repair, Rockville Centre - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Rockville Centre - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Rockville Centre
- Sewing Buttons, Rockville Centre
- Sewing Machine Repair & Service, Rockville Centre
- Sewing Machines, Equipment & Supplies, Rockville Centre
- Sheet Metal, Rockville Centre
- Shirts & T-Shirts, Rockville Centre
- Shish Kebab Restaurants, Rockville Centre
- Shoe Dyers, Rockville Centre
- Shoe Repair Shops, Rockville Centre
- Shoe Store - More, Rockville Centre
- Shoe Stores, Rockville Centre - Mens, Womens & Kids Shoes
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- Shopping & Shopping Services, Rockville Centre
- Sign Products & Services, Rockville Centre
- Signs, Rockville Centre
- Signs Permit Agencies, Rockville Centre
- Ski Shops - Equipment & Supplies Sales & Rental, Rockville Centre
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Rockville Centre
- Small Appliances, Rockville Centre
- Snacks & Desserts, Rockville Centre
- Social Clubs & Organizations, Rockville Centre
- Social Services & Welfare, Rockville Centre
- Social Workers & Services, Rockville Centre
- Societies & Foundation Associations, Rockville Centre
- Sororities, Rockville Centre
- Special Events & Party Supply Rental, Rockville Centre
- Special Interest Schools Or Instruction, Rockville Centre
- Specialty Animal Services, Rockville Centre
- Specialty Stores, Rockville Centre
- Speech & Hearing Specialists, Rockville Centre
- Speech Pathologists, Rockville Centre - Speech & Language Therapy
- Sporting Goods Equipment Rental, Rockville Centre
- Sporting Goods Stores, Rockville Centre
- Sports Medicine, Rockville Centre - Doctors, Physicians & Surgeons
- Sportswear Clothing Stores, Rockville Centre - Sports Clothes
- Sprinkler Alarm Systems, Rockville Centre - Fire Sprinkler Systems
- Staffing & Support Services, Rockville Centre
- State Government, Rockville Centre
- Stationery Manufacturers, Rockville Centre
- Steak House Restaurants, Rockville Centre
- Steel & Metal Goods, Rockville Centre - Steel Distributors
- Steel Erection Contractors, Rockville Centre - Steel Erectors
- Steel Manufacturers, Rockville Centre
- Stereo, Audio & Video Equipment Dealers & Stores, Rockville Centre
- Stocks & Bond Brokers, Rockville Centre
- Structural Engineer, Rockville Centre
- Surfboard & Windsurfing Equipment Shops, Rockville Centre
- Surveyor Services, Rockville Centre - Surveying Service
- Sushi Restaurants, Rockville Centre
- Swimwear & Accessories Shops, Rockville Centre - Water Sports Equipment
- Synagogues & Temples, Rockville Centre
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