- Satellite TV Service, Lockport
- Secondary Schools, Lockport
- Security & Surveillance System & Equipment, Lockport
- Security Brokers & Dealers, Lockport
- Security Investigative Services, Lockport
- Security Services, Lockport
- Senior Citizens Service & Health Organizations, Lockport
- Septic Tank Pumping & Cleaning, Lockport - Septic Systems
- Sewer & Drain Cleaning & Repair, Lockport - Drain Cleaner & Installation Services
- Sheriff's Department, Lockport
- Ship & Boat Building & Repairing, Lockport
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- Shopping & Shopping Services, Lockport
- Signs, Lockport
- Social Services & Welfare, Lockport
- Solar Equipment, Lockport
- Specialty Stores, Lockport
- Specialty Vehicle Rental & Leasing, Lockport
- State Government, Lockport
- Steel & Metal Goods, Lockport - Steel Distributors
- Sugar Retail, Lockport
- Swimming, Lockport
- Swimming Pools Supplies, Equipment & Accessories, Lockport
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