- Salvage Yards, Junk Yards & Wrecker Service, New Haven
- Sandwich Shop Restaurants, New Haven
- Satellite Dish Antennas & Equipment Dealers, New Haven
- Savings Banks, New Haven
- Sawmill & Planing Mills, New Haven
- Sawmill Supplies & Equipment Repair, New Haven
- Scrap & Waste Machinery, New Haven
- Scrap & Waste Materials, New Haven
- Secondary Schools, New Haven
- Security Brokers & Dealers, New Haven
- Septic Tank Installation & Repair, New Haven - Septic Systems
- Septic Tank Pumping & Cleaning, New Haven - Septic Systems
- Septic Tanks & Septic Systems Contractors, New Haven - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, New Haven - Drain Cleaner & Installation Services
- Sewer Construction Contractors, New Haven - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, New Haven
- Shirts & T-Shirts, New Haven
- Shopping & Shopping Services, New Haven
- Siding Contractors, New Haven - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sign Equipment & Supplies, New Haven
- Signs, New Haven
- Snacks & Desserts, New Haven
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- Snow Removal Services, New Haven - Snow Plow Service
- Social Clubs & Organizations, New Haven
- Social Services & Welfare, New Haven
- Special Dies Tools Jigs & Fixtures Manufacturers, New Haven
- Special Interest Schools Or Instruction, New Haven
- Speciality Food Stores, New Haven
- Specialty Goods Storage, New Haven
- Specialty Stores, New Haven
- Sporting Goods Equipment Rental, New Haven
- Sporting Goods Stores, New Haven
- Sportswear Manufacturers, New Haven
- Sportswear Wholesale, New Haven
- Staffing & Support Services, New Haven
- Steel & Metal Goods, New Haven - Steel Distributors
- Steel Manufacturers, New Haven
- Stocks & Bond Brokers, New Haven
- Stoves & Furnace Equipment, New Haven - Fittings & Repair Parts
- Surplus & Salvage Merchandise, New Haven
- Survey Interviewing & Reports, New Haven
- Sweepers & Scrubbers Industrial, New Haven - Sweeping Service
- Swimming Pools, New Haven
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