- Sales & Marketing Consultant, Ellisville
- Satellite Dish Antennas & Equipment Dealers, Ellisville
- Savings Banks, Ellisville
- Schools For The Physically Challenged, Ellisville
- Screen Houses, Ellisville
- Screen Printing, Ellisville
- Seafood Restaurants, Ellisville
- Secondary Schools, Ellisville
- Security Alarm Systems - Home & Business, Ellisville
- Security Brokers & Dealers, Ellisville
- Security Control Systems & Monitoring, Ellisville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Ellisville
- Security Services, Ellisville
- Self Defense Programs, Ellisville
- Shipping Service, Ellisville
- Shopping & Shopping Services, Ellisville
- Siding Contractors, Ellisville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Skin Care & Cosmetology Salons, Ellisville
- Skin Care Products & Treatments, Ellisville
- Small Appliances, Ellisville
- Snacks & Desserts, Ellisville
- Snow Removal Equipment Repair & Service, Ellisville
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- Social Clubs & Organizations, Ellisville
- Social Services & Welfare, Ellisville
- Special Education & Care, Ellisville
- Special Interest Schools Or Instruction, Ellisville
- Speciality Food Stores, Ellisville
- Specialty Stores, Ellisville
- Speech & Hearing Specialists, Ellisville
- Sporting Goods - Other, Ellisville
- Sporting Goods Stores, Ellisville
- Sports Medicine, Ellisville - Doctors, Physicians & Surgeons
- Staffing & Support Services, Ellisville
- Steak House Restaurants, Ellisville
- Steel & Metal Goods, Ellisville - Steel Distributors
- Stock & Bond Brokers & Dealers, Ellisville
- Stocks & Bond Brokers, Ellisville
- Substance Abuse Clinics, Ellisville - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Surgical Supplies & Equipment, Ellisville
- Surveyor Services, Ellisville - Surveying Service
- Swimming Pool, Sauna & Spa Contractors, Ellisville
- Swimming Pools Contractors, Ellisville - Install Inground - Above Ground Pools
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Ellisville
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