- Sandwich Shop Restaurants, Clarksville
- Savings Banks, Clarksville
- Seafood Restaurants, Clarksville
- Secondary Schools, Clarksville
- Security & Surveillance System & Equipment, Clarksville
- Security Brokers & Dealers, Clarksville
- Security Services, Clarksville
- Septic Tanks & Systems, Clarksville - Wholesale, Dealers & Suppliers
- Shock Absorber, Clarksville
- Shock Absorbers & Struts, Clarksville
- Shopping & Shopping Services, Clarksville
- Signs, Clarksville
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- Social Services & Welfare, Clarksville
- Special Interest Schools Or Instruction, Clarksville
- Specialty Animal Services, Clarksville
- Specialty Stores, Clarksville
- Specialty Vehicle Rental & Leasing, Clarksville
- Sporting Goods Stores, Clarksville
- Sports Clubs, Clarksville
- Sportswear Clothing Stores, Clarksville - Sports Clothes
- Stamp Collecting & Coin Dealers , Clarksville
- State Government, Clarksville
- Stocks & Bond Brokers, Clarksville
- Stone, Clarksville
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