- Salvation Army, Lockport
- Sandwich Shop Restaurants, Lockport
- Satellite & Cable TV Equipment & Systems, Lockport
- Satellite Descrambling & Programming Service, Lockport
- Satellite Dish Antennas & Equipment Dealers, Lockport
- Satellite TV Service, Lockport
- Savings Banks, Lockport
- School - Christian, Lockport
- Scientific & Laboratory Equipment & Instruments, Lockport
- Scrap & Waste Machinery, Lockport
- Scrap & Waste Materials, Lockport
- Secondary Schools, Lockport
- Security & Surveillance System & Equipment, Lockport
- Security Alarm Systems - Home & Business, Lockport
- Security Brokers & Dealers, Lockport
- Security Control Systems & Monitoring, Lockport - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Lockport
- Senior Citizens Information & Services, Lockport
- Senior Citizens Service & Health Organizations, Lockport
- Septic Tanks & Systems, Lockport - Wholesale, Dealers & Suppliers
- Service Establishment Supplies & Equipment, Lockport
- Sewing & Yarn Stores & Supplies, Lockport
- Sewing Machine Repair & Service, Lockport
- Sewing Machines, Equipment & Supplies, Lockport
- Sharpening Service, Lockport
- Sheet Metal, Lockport
- Sheet Metal Contractors, Lockport - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Lockport
- Shoe Repair Shops, Lockport
- Shoe Stores, Lockport - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Lockport
- Siding Contractors, Lockport - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sign Hanging & Installation Service, Lockport - Signs Erectors & Hangers
- Signs, Lockport
- Sleep Disorders Treatment & Information Centers, Lockport
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- Small Appliances, Lockport
- Snacks & Desserts, Lockport
- Snow Removal Services, Lockport - Snow Plow Service
- Snowmobile Dealers, Lockport - Parts, Gear, Clothing & Accessories
- Social Service Organizations Mental Health Services, Lockport
- Social Service Organizations Volunteer Services, Lockport
- Social Services & Welfare, Lockport
- Societies & Foundation Associations, Lockport
- Special Interest Schools Or Instruction, Lockport
- Speciality Food Stores, Lockport
- Specialty Animal Services, Lockport
- Specialty Stores, Lockport
- Speech & Hearing Specialists, Lockport
- Sporting & Recreational Camps, Lockport
- Sporting Goods Stores, Lockport
- Sports Clubs, Lockport
- Sportswear Manufacturers, Lockport
- Sprinkler Alarm Systems, Lockport - Fire Sprinkler Systems
- Staffing & Support Services, Lockport
- State Government, Lockport
- Steak House Restaurants, Lockport
- Steel & Metal Goods, Lockport - Steel Distributors
- Steel Manufacturers, Lockport
- Steel Mills & Blast Furnaces, Lockport
- Stock & Bond Brokers & Dealers, Lockport
- Stocks & Bond Brokers, Lockport
- Stone, Lockport
- Store Fixtures, Lockport
- Support Services, Lockport
- Surveyor Services, Lockport - Surveying Service
- Sushi Restaurants, Lockport
- Swimming Pool, Sauna & Spa Contractors, Lockport
- Swimming Pools Contractors, Lockport - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Lockport
- Swimming Pools Supplies, Equipment & Accessories, Lockport
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