- Sand Gravel & Aggregate, Haddam
- Sandblasting, Haddam - General Contractors
- Sandwich Shop Restaurants, Haddam
- Savings & Loan Associations, Haddam
- Savings Banks, Haddam
- Secondary Schools, Haddam
- Semiconductors & Equipment, Haddam
- Senior Citizens Service & Health Organizations, Haddam
- Septic Tank Installation & Repair, Haddam - Septic Systems
- Septic Tank Pumping & Cleaning, Haddam - Septic Systems
- Septic Tanks & Septic Systems Contractors, Haddam - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems Inspection, Haddam
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- Sewer & Drain Cleaning & Repair, Haddam - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Haddam
- Shopping & Shopping Services, Haddam
- Social Services & Welfare, Haddam
- Social Workers & Services, Haddam
- Societies & Foundation Associations, Haddam
- Specialty Stores, Haddam
- Sporting Goods Equipment Rental, Haddam
- State Government, Haddam
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Haddam
- Swimming Pools Supplies, Equipment & Accessories, Haddam
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