- Safety & Security Systems & Consultants, Markham
- Sales & Marketing Consultant, Markham
- Salvage Yards, Junk Yards & Wrecker Service, Markham
- Sandwich Shop Restaurants, Markham
- School Bus Transportation Service, Markham
- Seafood Restaurants, Markham
- Secondary Schools, Markham
- Senior Citizens Service & Health Organizations, Markham
- Sewer & Drain Cleaning & Repair, Markham - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Markham
- Siding Contractors, Markham - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Skating Rink & Hockey Operation Services, Markham
- Snow Removal Services, Markham - Snow Plow Service
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- Social Services & Welfare, Markham
- Sod & Sodding Service, Markham
- Spare Rib Restaurants, Markham
- Special Interest Schools Or Instruction, Markham
- Special Needs Transportation, Markham
- Specialty Animal Services, Markham
- Specialty Stores, Markham
- Spiritual Church, Markham
- Staffing & Support Services, Markham
- Steel & Metal Goods, Markham - Steel Distributors
- Steel Manufacturers, Markham
- Substance Abuse Clinics, Markham - Alcoholism, Addiction & Drug Abuse Treatment Centers
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