- Safety Equipment & Supplies, Port Allen
- Salvage Yards, Port Allen - Auto, Motorcycle, Boat, Trucks, etc
- Sand Gravel & Aggregate, Port Allen
- Sandwich Shop Restaurants, Port Allen
- Satellite Dish Antennas & Equipment Dealers, Port Allen
- Satellite TV Service, Port Allen
- Scaffolding & Aerial Lifts, Port Allen
- Scrap & Waste Materials, Port Allen
- Seafood Restaurants, Port Allen
- Secondary Schools, Port Allen
- Secretarial & Court Reporting Services, Port Allen
- Security & Surveillance System & Equipment, Port Allen
- Security Brokers & Dealers, Port Allen
- Septic Tanks & Septic Systems Contractors, Port Allen - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sheet Metal Contractors, Port Allen - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Port Allen
- Sheriff's Department, Port Allen
- Ship & Boat Building & Repairing, Port Allen
- Shoe Repair Shops, Port Allen
- Shooting & Target Ranges, Port Allen
- Shopping & Shopping Services, Port Allen
- Siding Contractors, Port Allen - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
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- Social Clubs & Organizations, Port Allen
- Social Services & Welfare, Port Allen
- Special Coatings, Port Allen - Protective Coatings
- Special Events & Party Supply Rental, Port Allen
- Specialty Animal Services, Port Allen
- Specialty Stores, Port Allen
- Sporting Goods Stores, Port Allen
- Sports Bars & Lounges, Port Allen
- Sportswear Manufacturers, Port Allen
- Sportswear Wholesale, Port Allen
- Staffing & Support Services, Port Allen
- State Government, Port Allen
- Steamship Companies & Agencies, Port Allen
- Steel & Metal Goods, Port Allen - Steel Distributors
- Steel Erection Contractors, Port Allen - Steel Erectors
- Steel Manufacturers, Port Allen
- Stocks & Bond Brokers, Port Allen
- Stone, Port Allen
- Surgical Appliances & Supplies Manufacturers, Port Allen
- Surveyor Services, Port Allen - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Port Allen
- Swimming Pools Contractors, Port Allen - Install Inground - Above Ground Pools
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