- Sand Gravel & Aggregate, Mercer
- Sandwich Shop Restaurants, Mercer
- Senior Citizen Counseling, Mercer
- Senior Citizens Service & Health Organizations, Mercer
- Septic Tank Installation & Repair, Mercer - Septic Systems
- Septic Tank Pumping & Cleaning, Mercer - Septic Systems
- Septic Tanks & Septic Systems Contractors, Mercer - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Mercer - Wholesale, Dealers & Suppliers
- Sheet Metal Contractors, Mercer - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Mercer
- Shopping & Shopping Services, Mercer
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- Snacks & Desserts, Mercer
- Snowmobile Dealers, Mercer - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Mercer
- Soil Testing Labs, Mercer - Concrete Testing
- Specialty Stores, Mercer
- Sporting Goods Equipment Rental, Mercer
- Sporting Goods Stores, Mercer
- Sports Schools & Training Camps, Mercer
- State Government, Mercer
- Supper Club Restaurants, Mercer
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