- Sand Gravel & Aggregate, Fennville
- Sandwich Shop Restaurants, Fennville
- Secondary Schools, Fennville
- Security & Commodity Brokers, Fennville
- Septic Tank Installation & Repair, Fennville - Septic Systems
- Septic Tank Pumping & Cleaning, Fennville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Fennville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Shopping & Shopping Services, Fennville
- Small Appliances, Fennville
- Snacks & Desserts, Fennville
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- Snowmobile Dealers, Fennville - Parts, Gear, Clothing & Accessories
- Social Services & Welfare, Fennville
- Social Workers & Services, Fennville
- Specialty Stores, Fennville
- Sporting Goods Stores, Fennville
- Sports & Recreational Services, Fennville
- State Government, Fennville
- Stationery Engravers, Fennville
- Steel Manufacturers, Fennville
- Stoves & Furnace Equipment, Fennville - Fittings & Repair Parts
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