- Sandwich Shop Restaurants, Madisonville
- Satellite Communication Downlinking & Uplinking, Madisonville
- Satellite Dish Antennas & Equipment Dealers, Madisonville
- Savings & Loan Associations, Madisonville
- Savings Banks, Madisonville
- Seafood Restaurants, Madisonville
- Secondary Schools, Madisonville
- Security & Surveillance System & Equipment, Madisonville
- Security Brokers & Dealers, Madisonville
- Security Services, Madisonville
- Septic Tank Installation & Repair, Madisonville - Septic Systems
- Septic Tank Pumping & Cleaning, Madisonville - Septic Systems
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- Septic Tanks & Septic Systems Contractors, Madisonville - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sheriff's Department, Madisonville
- Shopping & Shopping Services, Madisonville
- Signs, Madisonville
- Social Services & Welfare, Madisonville
- Specialty Animal Services, Madisonville
- Specialty Goods Storage, Madisonville
- Specialty Stores, Madisonville
- Sporting Goods Stores, Madisonville
- State Government, Madisonville
- Steak House Restaurants, Madisonville
- Stocks & Bond Brokers, Madisonville
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