- Sales & Marketing Consultant, Duncan
- Salvage Yards, Junk Yards & Wrecker Service, Duncan
- Sand Gravel & Aggregate, Duncan
- Sandblasting Equipment & Supplies, Duncan
- Sandwich Shop Restaurants, Duncan
- Satellite TV Service, Duncan
- Savings Banks, Duncan
- Scientific & Laboratory Equipment & Instruments, Duncan
- Scrap & Waste Machinery, Duncan
- Scrap & Waste Materials, Duncan
- Sealants Retail, Duncan
- Secondary Schools, Duncan
- Security & Surveillance System & Equipment, Duncan
- Security Alarm Systems - Home & Business, Duncan
- Security Brokers & Dealers, Duncan
- Security Services, Duncan
- Sewing & Yarn Stores & Supplies, Duncan
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- Shipping Companies, Duncan
- Shopping & Shopping Services, Duncan
- Siding Materials, Duncan
- Social Services & Welfare, Duncan
- Societies & Foundation Associations, Duncan
- Sod & Sodding Service, Duncan
- Southern Style Restaurants, Duncan
- Special Coatings, Duncan - Protective Coatings
- Specialty Animal Services, Duncan
- Specialty Communication Companies & Services, Duncan
- Specialty Stores, Duncan
- Sporting Goods Stores, Duncan
- Staffing & Support Services, Duncan
- Steel & Metal Goods, Duncan - Steel Distributors
- Stocks & Bond Brokers, Duncan
- Submarine Sandwich Restaurants, Duncan
- Swimming Pools Supplies, Equipment & Accessories, Duncan
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