- Sawmill Equipment & Supplies, McMasterville
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, McMasterville
- Secondary Schools, McMasterville
- Senior Citizens Service & Health Organizations, McMasterville
- Sewing Machine Repair & Service, McMasterville
- Sewing Machines, Equipment & Supplies, McMasterville
- Sharpening Service, McMasterville
- Shopping & Shopping Services, McMasterville
- Skating Supplies, McMasterville - Ice, Inline, Speed, Figure & Roller Skates
- Small Appliances, McMasterville
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- Soccer Clubs, McMasterville
- Social Consultants, McMasterville
- Social Services & Welfare, McMasterville
- Societies & Foundation Associations, McMasterville
- Special Events Photographers, McMasterville
- Specialty Stores, McMasterville
- Sporting Goods Stores, McMasterville
- Stairs & Railings Contractors, McMasterville - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, McMasterville
- Swimwear & Accessories Shops, McMasterville - Water Sports Equipment
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