- Safe & Vault, Markham
- Safety & Security Systems & Consultants, Markham
- Safety Equipment & Supplies, Markham
- Safety Training Schools, Markham
- Sales & Marketing Consultant, Markham
- Salvation Army, Markham
- Sand Gravel & Aggregate, Markham
- Sandwich Shop Restaurants, Markham
- Satellite & Cable TV Equipment & Systems Repair & Service, Markham
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Markham
- Scaffolding & Aerial Lifts, Markham
- Scales Retail, Markham
- School Furniture, Markham
- Schools Montessori Instruction, Markham
- Scientific & Laboratory Equipment & Instruments, Markham
- Scrap & Waste Machinery, Markham
- Scrap & Waste Materials, Markham
- Scrapbooks & Scrapbook Supplies, Markham
- Screen Printing, Markham
- Screen Printing Supplies & Equipment, Markham
- Seafood Restaurants, Markham
- Secondary Schools, Markham
- Secretarial & Court Reporting Services, Markham
- Security & Commodity Exchanges, Markham
- Security & Surveillance System & Equipment, Markham
- Security Alarm Systems - Home & Business, Markham
- Security Brokers & Dealers, Markham
- Security Control Systems & Monitoring, Markham - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Markham - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Markham
- Security Services, Markham
- Senior Citizens Housing, Markham
- Senior Citizens Service & Health Organizations, Markham
- Service & Gas Station Equipment & Services, Markham
- Service Establishment Supplies & Equipment, Markham
- Service Industry Manufacturers Machinery, Markham
- Services Allied With The Exchange Of Securities & Commodities, Markham
- Sewer & Drain Cleaning & Repair, Markham - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Markham - Sewer Line, Pipe Installation & Repair Services
- Sewer Line Inspection & Maintenance, Markham
- Sewing & Yarn Stores & Supplies, Markham
- Sewing Contractors, Markham
- Sewing Machine Repair & Service, Markham
- Sewing Machines, Equipment & Supplies, Markham
- Sharpening Service, Markham
- Sheet Metal, Markham
- Sheet Metal Contractors, Markham - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Markham
- Sheet Metal Work - Aluminum, Tin, Stainless Steel, etc, Markham - Sheet Metal Products
- Shelving & Shelves, Markham - Metal, Steel, Wire & Glass Shelving Units & Storage - Wall Shelves
- Shelving Equipment, Markham
- Shipping Companies, Markham
- Shipping Service, Markham
- Shoe Repair Shops, Markham
- Shoe Repair Supplies & Equipment, Markham
- Shoe Store - More, Markham
- Shoe Stores, Markham - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Markham
- Short Term Business Credit Institutions, Markham
- Shutters - Interior & Exterior, Markham - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Markham - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Siding Materials, Markham
- Sign Equipment & Supplies, Markham
- Sign Supplies & Sign Making Equipment, Markham
- Signs, Markham
- Ski Shops - Equipment & Supplies Sales & Rental, Markham
- Ski, Snowboard & Snowmobile Shop - Equipment Rental & Services, Markham
- Skin Care & Cosmetology Salons, Markham
- Skin Care Products & Treatments, Markham
- Sleds, Snowboards & Snowshoes Shops, Markham - Snow Sleds, Toboggans, Helmets, Boots, Goggles, Clothing, Gear & More
- Sleep Disorders Treatment & Information Centers, Markham
- Small Appliances, Markham
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- Snack Foods, Markham
- Snacks & Desserts, Markham
- Snow Removal Services, Markham - Snow Plow Service
- Soaps & Cosmetics, Markham
- Soccer Clubs, Markham
- Social Clubs & Organizations, Markham
- Social Services & Welfare, Markham
- Societies & Foundation Associations, Markham
- Solar Equipment, Markham
- Sound Systems, Microphones & Equipment, Markham
- Special Coatings, Markham - Protective Coatings
- Special Dies Tools Jigs & Fixtures Manufacturers, Markham
- Special Education & Care, Markham
- Special Events Photographers, Markham
- Special Interest Schools Or Instruction, Markham
- Special Needs Transportation, Markham
- Speciality Food Stores, Markham
- Specialty Animal Services, Markham
- Specialty Communication Companies & Services, Markham
- Specialty Goods Storage, Markham
- Specialty Stores, Markham
- Speech & Hearing Specialists, Markham
- Sporting Goods Stores, Markham
- Sports & Recreational Services, Markham
- Sports Clubs, Markham
- Sports Medicine, Markham - Doctors, Physicians & Surgeons
- Sports Promoters & Managers, Markham
- Sports Promotions & Special Events, Markham
- Sportswear Clothing Stores, Markham - Sports Clothes
- Sportswear Manufacturers, Markham
- Sportswear Wholesale, Markham
- Spraying Booths & Equipment, Markham
- Springs Automotive, Markham
- Sprinkler Alarm Systems, Markham - Fire Sprinkler Systems
- Stadiums, Arenas, Coliseums & Athletic Fields, Markham
- Staffing & Support Services, Markham
- Stairs & Railings Contractors, Markham - Metal & Wood Stairs, Spiral Staircase & Stair Railing - Installation & Repair
- Stairs, Balcony, Terrace & Steeple Contractors, Markham
- Stamp Collecting & Coin Dealers , Markham
- Stationery & Office Supplies, Markham
- Stationery Manufacturers, Markham
- Steak House Restaurants, Markham
- Steel & Metal Goods, Markham - Steel Distributors
- Steel Erection Contractors, Markham - Steel Erectors
- Steel Manufacturers, Markham
- Steel Mills & Blast Furnaces, Markham
- Steel Reinforcing Fabricators, Markham
- Steel Rule Dies, Markham
- Steel Work Contractors, Markham
- Stereo, Audio & Video Equipment Dealers & Stores, Markham
- Stitching Services, Markham
- Stock & Bond Brokers & Dealers, Markham
- Stocks & Bond Brokers, Markham
- Stone Setting Contractors, Markham
- Storage & Closet Equipment Supplies & Materials, Markham
- Store & Retail Fixtures & Display Manufacturers, Markham
- Store Fixtures & Display Equipment, Markham
- Store Fronts, Markham - Storefront
- Stoves & Furnace Equipment, Markham - Fittings & Repair Parts
- Structural Steel Erection, Markham
- Submarine Sandwich Restaurants, Markham
- Sunroom & Solarium Construction Contractors, Markham
- Surgical Supplies & Equipment, Markham
- Surgical Supplies, Instruments, Tools & Equipment, Markham
- Surveyor Services, Markham - Surveying Service
- Sushi Restaurants, Markham
- Sweepers & Scrubbers Industrial, Markham - Sweeping Service
- Swimming Pool, Sauna & Spa Contractors, Markham
- Swimming Pools Contractors, Markham - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Markham
- Swimming Pools Supplies, Equipment & Accessories, Markham
- Synagogues & Temples, Markham
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