- Sales & Marketing Consultant, Port Dover
- Sandwich Shop Restaurants, Port Dover
- Scales Retail, Port Dover
- Seafood Restaurants, Port Dover
- Secondary Schools, Port Dover
- Security Brokers & Dealers, Port Dover
- Septic Systems Installation & Repair, Port Dover
- Septic Tanks & Septic Systems Contractors, Port Dover - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewing & Yarn Stores & Supplies, Port Dover
- Ship & Boat Building & Repairing, Port Dover
- Shopping & Shopping Services, Port Dover
- Shutters - Interior & Exterior, Port Dover - Wood, Vinyl, Window, Plantation Shutters, etc
- Social Services & Welfare, Port Dover
- Societies & Foundation Associations, Port Dover
- Special Interest Schools Or Instruction, Port Dover
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- Speciality Food Stores, Port Dover
- Specialty Stores, Port Dover
- Sporting Goods Stores, Port Dover
- Sports Promoters & Managers, Port Dover
- Sports Promotions & Special Events, Port Dover
- Sportswear Clothing Stores, Port Dover - Sports Clothes
- Stadiums, Arenas, Coliseums & Athletic Fields, Port Dover
- Steamship Companies & Agencies, Port Dover
- Stocks & Bond Brokers, Port Dover
- Stone & Rock Quarry, Port Dover - Gravel Pit, Shale, Granite, Limestone, Crushed Rock, etc
- Store Fixtures & Display Equipment, Port Dover
- Stoves & Furnace Equipment, Port Dover - Fittings & Repair Parts
- Stress Management & Counseling, Port Dover
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Port Dover
- Swimwear & Accessories Shops, Port Dover - Water Sports Equipment
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