- Sandwich Shop Restaurants, Freeport
- Screen Printing, Freeport
- Security Alarm Systems - Home & Business, Freeport
- Security Brokers & Dealers, Freeport
- Security Control Systems & Monitoring, Freeport - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Freeport
- Senior Citizens Service & Health Organizations, Freeport
- Sewage Plant Operation, Freeport
- Sewer Cleaning Equipment & Supplies, Freeport - Sewer Builders
- Sheet Metal, Freeport
- Sheet Metal Contractors, Freeport - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Freeport
- Shirts & T-Shirts, Freeport
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- Shopping & Shopping Services, Freeport
- Social Services & Welfare, Freeport
- Societies & Foundation Associations, Freeport
- Special Dies Tools Jigs & Fixtures Manufacturers, Freeport
- Special Events & Party Supply Rental, Freeport
- Special Interest Schools Or Instruction, Freeport
- Specialty Stores, Freeport
- Sporting Goods Equipment Rental, Freeport
- Sporting Goods Stores, Freeport
- State Government, Freeport
- Stocks & Bond Brokers, Freeport
- Stoves & Furnace Equipment, Freeport - Fittings & Repair Parts
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