- Safe & Vault, East Dundee
- Safety & Security Systems & Consultants, East Dundee
- Sales & Marketing Consultant, East Dundee
- Sandwich Shop Restaurants, East Dundee
- Scrap & Waste Materials, East Dundee
- Seafood Restaurants, East Dundee
- Secondary Schools, East Dundee
- Service Establishment Supplies & Equipment, East Dundee
- Sewing Contractors, East Dundee
- Sheet Metal Contractors, East Dundee - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, East Dundee
- Shopping & Shopping Services, East Dundee
- Small Appliances, East Dundee
- Smoke Stacks Manufacturers, East Dundee
- Snacks & Desserts, East Dundee
- Social Services & Welfare, East Dundee
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- Societies & Foundation Associations, East Dundee
- Special Dies Tools Jigs & Fixtures Manufacturers, East Dundee
- Special Events & Party Supply Rental, East Dundee
- Specialty Stores, East Dundee
- Sporting Goods Equipment Rental, East Dundee
- Sporting Goods Stores, East Dundee
- Sprinkler Alarm Systems, East Dundee - Fire Sprinkler Systems
- Steak House Restaurants, East Dundee
- Storage & Closet Equipment Supplies & Materials, East Dundee
- Stoves & Furnace Equipment, East Dundee - Fittings & Repair Parts
- Structural Engineer, East Dundee
- Submarine Sandwich Restaurants, East Dundee
- Sunrooms & Solarium Construction Contractors, East Dundee - Build & Repair
- Sunrooms, Greenhouses, Solariums & Atrium Builders, East Dundee - Build & Repair
- Surveyor Services, East Dundee - Surveying Service
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