- Sales & Marketing Consultant, Duncanville
- Sand Gravel & Aggregate, Duncanville
- Sandwich Shop Restaurants, Duncanville
- Satellite Descrambling & Programming Service, Duncanville
- Satellite Dish Antennas & Equipment Dealers, Duncanville
- Satellite TV Service, Duncanville
- Savings & Loan Associations, Duncanville
- Savings Banks, Duncanville
- Screen Printing, Duncanville
- Seafood Restaurants, Duncanville
- Security & Surveillance System & Equipment, Duncanville
- Security Alarm Systems - Home & Business, Duncanville
- Security Brokers & Dealers, Duncanville
- Security Control Systems & Monitoring, Duncanville - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Investigative Services, Duncanville
- Security Services, Duncanville
- Senior Citizens Service & Health Organizations, Duncanville
- Service Establishment Supplies & Equipment, Duncanville
- Sewer & Drain Cleaning & Repair, Duncanville - Drain Cleaner & Installation Services
- Sewing & Yarn Stores & Supplies, Duncanville
- Sewing Contractors, Duncanville
- Sewing Machines, Equipment & Supplies, Duncanville
- Sharpening Service, Duncanville
- Sheet Metal Contractors, Duncanville - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Duncanville
- Shoe Stores, Duncanville - Mens, Womens & Kids Shoes
- Shooting & Target Ranges, Duncanville
- Shopping & Shopping Services, Duncanville
- Short Term Business Credit Institutions, Duncanville
- Shutters - Interior & Exterior, Duncanville - Wood, Vinyl, Window, Plantation Shutters, etc
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- Siding Contractors, Duncanville - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Sign Equipment & Supplies, Duncanville
- Signs, Duncanville
- Silk Flowers & Plants Rental & Leasing, Duncanville
- Skating Rink & Hockey Operation Services, Duncanville
- Small Appliances, Duncanville
- Snacks & Desserts, Duncanville
- Social Service Organizations Womens Services, Duncanville
- Social Services & Welfare, Duncanville
- Societies & Foundation Associations, Duncanville
- Special Dies Tools Jigs & Fixtures Manufacturers, Duncanville
- Special Interest Schools Or Instruction, Duncanville
- Speciality Food Stores, Duncanville
- Specialty Animal Services, Duncanville
- Specialty Stores, Duncanville
- Sporting Goods Stores, Duncanville
- Sprinkler Alarm Systems, Duncanville - Fire Sprinkler Systems
- Sprinkler System Contractors, Duncanville - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Duncanville
- State Government, Duncanville
- Steel & Metal Goods, Duncanville - Steel Distributors
- Stock & Bond Brokers & Dealers, Duncanville
- Stocks & Bond Brokers, Duncanville
- Store Fronts, Duncanville - Storefront
- Stress Management & Counseling, Duncanville
- Stripers Mechanical, Duncanville
- Swimming Pools Repair, Service, Supplies, Sale & Installation, Duncanville
- Swimming Pools Supplies, Equipment & Accessories, Duncanville
- Synagogues & Temples, Duncanville
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