- Safety Equipment & Supplies, Dunnville
- Salvation Army, Dunnville
- Sand Gravel & Aggregate, Dunnville
- Sandblasting, Dunnville - General Contractors
- Sandwich Shop Restaurants, Dunnville
- Scaffolding & Aerial Lifts, Dunnville
- Seafood Restaurants, Dunnville
- Secondary Schools, Dunnville
- Security Brokers & Dealers, Dunnville
- Senior Citizens Housing, Dunnville
- Senior Citizens Service & Health Organizations, Dunnville
- Septic Systems Installation & Repair, Dunnville
- Septic Tank Pumping & Cleaning, Dunnville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Dunnville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Service Establishment Supplies & Equipment, Dunnville
- Shoe Stores, Dunnville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Dunnville
- Siding Contractors, Dunnville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Dunnville
- Small Appliances, Dunnville
- Smelters & Refiners Base Metals, Dunnville
- Snacks & Desserts, Dunnville
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- Social Services & Welfare, Dunnville
- Societies & Foundation Associations, Dunnville
- Sod & Sodding Service, Dunnville
- Sod Farms, Dunnville
- Special Events Photographers, Dunnville
- Special Interest Schools Or Instruction, Dunnville
- Speciality Food Stores, Dunnville
- Specialty Stores, Dunnville
- Sporting Goods Stores, Dunnville
- Sports Bars & Lounges, Dunnville
- Sports Promoters & Managers, Dunnville
- Sports Promotions & Special Events, Dunnville
- Staffing & Support Services, Dunnville
- Stoves & Furnace Equipment, Dunnville - Fittings & Repair Parts
- Substance Abuse Clinics, Dunnville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Dunnville - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Dunnville
- Swimming Pools, Dunnville
- Swimming Pools Contractors, Dunnville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Dunnville
- Swimming Pools Supplies, Equipment & Accessories, Dunnville
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