- Safety & Security Systems & Consultants, Old Lyme
- Sales & Marketing Consultant, Old Lyme
- Sandwich Shop Restaurants, Old Lyme
- Satellite TV Service, Old Lyme
- Science & Research, Old Lyme
- Seafood Restaurants, Old Lyme
- Secondary Schools, Old Lyme
- Security Alarm Systems - Home & Business, Old Lyme
- Security Brokers & Dealers, Old Lyme
- Security Services, Old Lyme
- Semiconductors & Equipment, Old Lyme
- Senior Citizens Service & Health Organizations, Old Lyme
- Septic Tank Installation & Repair, Old Lyme - Septic Systems
- Septic Tank Pumping & Cleaning, Old Lyme - Septic Systems
- Septic Tanks & Septic Systems Contractors, Old Lyme - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems Inspection, Old Lyme
- Sheet Metal Contractors, Old Lyme - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Old Lyme
- Ship & Boat Building & Repairing, Old Lyme
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- Shopping & Shopping Services, Old Lyme
- Snacks & Desserts, Old Lyme
- Snow Removal Services, Old Lyme - Snow Plow Service
- Social Services & Welfare, Old Lyme
- Societies & Foundation Associations, Old Lyme
- Solar Products & Services, Old Lyme
- Special Interest Schools Or Instruction, Old Lyme
- Specialty Stores, Old Lyme
- Sporting Goods Stores, Old Lyme
- Sports Teams & Franchises, Old Lyme
- Staffing & Support Services, Old Lyme
- State Administrative Agencies, Old Lyme
- State Government, Old Lyme
- Stone Setting Contractors, Old Lyme
- Surveyor Services, Old Lyme - Surveying Service
- Swimming Pools, Old Lyme
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Old Lyme
- Swimming Pools Supplies, Equipment & Accessories, Old Lyme
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