- Sand Gravel & Aggregate, Middleville
- Sandwich Shop Restaurants, Middleville
- Satellite & Cable TV Equipment & Systems Repair & Service, Middleville
- Satellite TV Service, Middleville
- Sawmill & Planing Mills, Middleville
- Sawmill Supplies & Equipment Repair, Middleville
- Screen Printing, Middleville
- Secondary Schools, Middleville
- Sewer & Drain Cleaning & Repair, Middleville - Drain Cleaner & Installation Services
- Shopping & Shopping Services, Middleville
- Snow Removal Services, Middleville - Snow Plow Service
- Social Services & Welfare, Middleville
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- Social Workers & Services, Middleville
- Special Interest Schools Or Instruction, Middleville
- Specialty Animal Services, Middleville
- Specialty Stores, Middleville
- Speech & Hearing Specialists, Middleville
- Sporting Goods Equipment Rental, Middleville
- Sporting Goods Stores, Middleville
- Staffing & Support Services, Middleville
- State Government, Middleville
- Stoves & Furnace Equipment, Middleville - Fittings & Repair Parts
- Submarine Sandwich Restaurants, Middleville
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