- Sand Gravel & Aggregate, Southampton
- Scrap & Waste Materials, Southampton
- Security & Surveillance System & Equipment, Southampton
- Security Services, Southampton
- Septic Tank Installation & Repair, Southampton - Septic Systems
- Septic Tank Pumping & Cleaning, Southampton - Septic Systems
- Septic Tanks & Septic Systems Contractors, Southampton - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shopping & Shopping Services, Southampton
- Siding Contractors, Southampton - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Southampton
- Snow Removal Services, Southampton - Snow Plow Service
- Social Services & Welfare, Southampton
- Societies & Foundation Associations, Southampton
- Sod & Sodding Service, Southampton
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- Special Dies Tools Jigs & Fixtures Manufacturers, Southampton
- Special Interest Schools Or Instruction, Southampton
- Specialty Animal Services, Southampton
- Specialty Stores, Southampton
- Speech & Hearing Specialists, Southampton
- Speech Pathologists, Southampton - Speech & Language Therapy
- Staffing & Support Services, Southampton
- Stairs & Railings Contractors, Southampton - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, Southampton
- Steel & Metal Goods, Southampton - Steel Distributors
- Steel Manufacturers, Southampton
- Surveyor Services, Southampton - Surveying Service
- Swimming Pools Supplies, Equipment & Accessories, Southampton
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