- Sand Gravel & Aggregate, Walkerton
- Sandwich Shop Restaurants, Walkerton
- Sawmill & Planing Mills, Walkerton
- Sawmill Supplies & Equipment Repair, Walkerton
- Scrap & Waste Materials, Walkerton
- Secondary Schools, Walkerton
- Septic Systems Installation & Repair, Walkerton
- Septic Tanks & Septic Systems Contractors, Walkerton - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shoe Stores, Walkerton - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Walkerton
- Siding Contractors, Walkerton - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Walkerton
- Small Appliances, Walkerton
- Social Services & Welfare, Walkerton
- Societies & Foundation Associations, Walkerton
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- Special Events Photographers, Walkerton
- Special Interest Schools Or Instruction, Walkerton
- Special Needs Transportation, Walkerton
- Specialty Animal Services, Walkerton
- Specialty Stores, Walkerton
- Speech & Hearing Specialists, Walkerton
- Sporting Goods Stores, Walkerton
- Sports Bars & Lounges, Walkerton
- Staffing & Support Services, Walkerton
- Steel Manufacturers, Walkerton
- Sushi Restaurants, Walkerton
- Swimming Pool, Sauna & Spa Contractors, Walkerton
- Swimming Pools, Walkerton
- Swimming Pools Contractors, Walkerton - Install Inground - Above Ground Pools
- Synthetic Resins & Rubber, Walkerton
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