- Sandblasting, Clarksville - General Contractors
- Sandwich Shop Restaurants, Clarksville
- Satellite Dish Antennas & Equipment Dealers, Clarksville
- Satellite TV Service, Clarksville
- Savings & Loan Associations, Clarksville
- Savings Banks, Clarksville
- Scales Retail, Clarksville
- Scalp Treatments & Products, Clarksville
- Scrap & Waste Materials, Clarksville
- Scrapbooks & Scrapbook Supplies, Clarksville
- Screen Houses, Clarksville
- Screen Printing, Clarksville
- Seafood Restaurants, Clarksville
- Secondary Schools, Clarksville
- Security & Surveillance System & Equipment, Clarksville
- Security Alarm Systems - Home & Business, Clarksville
- Security Brokers & Dealers, Clarksville
- Security Control Systems & Monitoring, Clarksville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Clarksville - Bodyguard, Guard Dogs, Etc
- Security Services, Clarksville
- Semi Precious Metals, 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
- Sewing & Yarn Stores & Supplies, Clarksville
- Sheriff's Department, 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
- Siding Materials, Clarksville
- Signs, Clarksville
- Skating Rink & Hockey Operation Services, Clarksville
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- Sleep Doctors, Clarksville - Specialists, Physicians & Surgeons (Sleep Medicine)
- Small Appliances, Clarksville
- Smelters & Refiners Base Metals, Clarksville
- Snacks & Desserts, Clarksville
- Social Services & Welfare, Clarksville
- Special Events & Party Supply Rental, Clarksville
- Special Interest Schools Or Instruction, Clarksville
- Speciality Food Stores, Clarksville
- Specialty Animal Services, Clarksville
- Specialty Stores, Clarksville
- Speech & Hearing Specialists, Clarksville
- Speech Pathologists, Clarksville - Speech & Language Therapy
- Sporting Goods Equipment Rental, Clarksville
- Sporting Goods Stores, Clarksville
- Sports & Recreational Services, Clarksville
- Sports Medicine, Clarksville - Doctors, Physicians & Surgeons
- Sportswear Clothing Stores, Clarksville - Sports Clothes
- Staffing & Support Services, Clarksville
- Stamp Collecting & Coin Dealers , Clarksville
- State Government, Clarksville
- Stationery & Office Supplies, Clarksville
- Steak House Restaurants, Clarksville
- Steel Manufacturers, Clarksville
- Stock & Bond Brokers & Dealers, Clarksville
- Stocks & Bond Brokers, Clarksville
- Store Fixtures & Display Equipment, Clarksville
- Substance Abuse Clinics, Clarksville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surveyor Services, Clarksville - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Clarksville
- Swimming Pools, Clarksville
- Swimming Pools Contractors, Clarksville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Clarksville
- Swimming Pools Supplies, Equipment & Accessories, Clarksville
- Swimwear & Accessories Shops, Clarksville - Water Sports Equipment
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