- Salvage Yards, Junk Yards & Wrecker Service, Magna
- Samoan Churches, Magna
- Sandblasting, Magna - General Contractors
- Sandwich Shop Restaurants, Magna
- Savings & Loan Associations, Magna
- Savings Banks, Magna
- Scrap & Waste Materials, Magna
- Secondary Schools, Magna
- Security Guard & Patrol Service, Magna - Bodyguard, Guard Dogs, Etc
- Security Investigative Services, Magna
- Security Services, Magna
- Shoe Store - More, Magna
- Shooting & Target Ranges, Magna
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- Shopping & Shopping Services, Magna
- Snacks & Desserts, Magna
- Social Services & Welfare, Magna
- Speciality Food Stores, Magna
- Specialty Animal Services, Magna
- Specialty Stores, Magna
- Sporting Goods Stores, Magna
- State Government, Magna
- Steel Manufacturers, Magna
- Stoves & Furnace Equipment, Magna - Fittings & Repair Parts
- Stucco Siding Contractors, Magna - Stucco Repair & Installation
- Stucco Siding, Granite & Grouting Contractors, Magna
- Stucco Stone, Magna
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