- Safety Equipment & Supplies, Galliano
- Sand Gravel & Aggregate, Galliano
- Sandwich Shop Restaurants, Galliano
- Satellite Descrambling & Programming Service, Galliano
- Satellite Dish Antennas & Equipment Dealers, Galliano
- Satellite TV Service, Galliano
- Seafood Restaurants, Galliano
- Secondary Schools, Galliano
- Security Services, Galliano
- Septic Tanks & Systems, Galliano - Wholesale, Dealers & Suppliers
- Sheriff's Department, Galliano
- Shirts & T-Shirts, Galliano
- Shopping & Shopping Services, Galliano
- Shutters - Interior & Exterior, Galliano - Wood, Vinyl, Window, Plantation Shutters, etc
- Signs, Galliano
- Smoothie Restaurants, Galliano
- Snacks & Desserts, Galliano
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- Social Services & Welfare, Galliano
- Societies & Foundation Associations, Galliano
- Special Education & Care, Galliano
- Special Events & Party Supply Rental, Galliano
- Special Interest Schools Or Instruction, Galliano
- Specialty Communication Companies & Services, Galliano
- Specialty Stores, Galliano
- Specialty Vehicle Rental & Leasing, Galliano
- Staffing & Support Services, Galliano
- State Government, Galliano
- Steel & Metal Goods, Galliano - Steel Distributors
- Steel Reinforcing Supplies, Galliano
- Stone, Galliano
- Substance Abuse Clinics, Galliano - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Support Services, Galliano
- Swimming, Galliano
- Swimming Pools Supplies, Equipment & Accessories, Galliano
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