- Safe, Lock & Key Repair Services, South Berwick - Safes & Vaults Opening & Repair
- Sales & Marketing Consultant, South Berwick
- Sandwich Shop Restaurants, South Berwick
- Scrap & Waste Machinery, South Berwick
- Scrap & Waste Materials, South Berwick
- Secondary Schools, South Berwick
- Security Brokers & Dealers, South Berwick
- Septic Tank Pumping & Cleaning, South Berwick - Septic Systems
- Septic Tanks & Septic Systems Contractors, South Berwick - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, South Berwick - Drain Cleaner & Installation Services
- Shopping & Shopping Services, South Berwick
- Siding Materials, South Berwick
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- Signs, South Berwick
- Small Appliances, South Berwick
- Snacks & Desserts, South Berwick
- Social Services & Welfare, South Berwick
- Social Workers & Services, South Berwick
- Sound Systems & Recording Equipment, South Berwick
- Specialty Stores, South Berwick
- Sporting Goods Stores, South Berwick
- Spray Painting & Finishing, South Berwick - Plastic, Furniture, Acrylic, Wood & Metal
- State Government, South Berwick
- Stocks & Bond Brokers, South Berwick
- Surveyor Services, South Berwick - Surveying Service
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