- Sandwich Shop Restaurants, Clarksville
- Satellite Dish Antennas & Equipment Dealers, Clarksville
- Satellite TV Service, Clarksville
- Sawmill Equipment & Supplies, Clarksville
- Sawmill, Paper & Woodworking Supplies, Machinery & Equipment, Clarksville
- Schools For The Physically Challenged, Clarksville
- Secondary Schools, Clarksville
- Security Brokers & Dealers, Clarksville
- Senior Citizens Service & Health Organizations, Clarksville
- Septic Tank Installation & Repair, Clarksville - Septic Systems
- Septic Tank Pumping & Cleaning, Clarksville - Septic Systems
- Septic Tanks & Septic Systems Contractors, Clarksville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewer & Drain Cleaning & Repair, Clarksville - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Clarksville - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Clarksville
- Sharpening Service, Clarksville
- Sheriff's Department, Clarksville
- Shipping Service, Clarksville
- Shoe Repair Shops, Clarksville
- Shoe Store - More, Clarksville
- Shoe Stores, Clarksville - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Clarksville
- Siding Contractors, Clarksville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Clarksville
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- Sleep Disorders Treatment & Information Centers, Clarksville
- Social Services & Welfare, Clarksville
- Societies & Foundation Associations, Clarksville
- Special Coatings, Clarksville - Protective Coatings
- Special Dies Tools Jigs & Fixtures Manufacturers, Clarksville
- Special Education & Care, Clarksville
- Special Interest Schools Or Instruction, Clarksville
- Specialty Animal Services, Clarksville
- Specialty Stores, Clarksville
- Speech & Hearing Specialists, Clarksville
- Speech & Language Therapy, Clarksville
- Sporting Goods Stores, Clarksville
- Staffing & Support Services, Clarksville
- State Government, Clarksville
- Stock & Bond Brokers & Dealers, Clarksville
- Stocks & Bond Brokers, Clarksville
- Stone Setting Contractors, Clarksville
- Storm Doors & Windows, Clarksville
- Submarine Sandwich Restaurants, Clarksville
- Substance Abuse Clinics, Clarksville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Clarksville - Surveying Service
- Swimming, Clarksville
- Swimming Pools Supplies, Equipment & Accessories, Clarksville
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