- Safe & Vault, Duncan
- Safety & Security Systems & Consultants, Duncan
- Sand Gravel & Aggregate, Duncan
- Sandblasting, Duncan - General Contractors
- Sandwich Shop Restaurants, Duncan
- Savings & Loan Associations, Duncan
- Savings Banks, Duncan
- School - Christian, Duncan
- Scientific & Laboratory Equipment & Instruments, Duncan
- Scrap & Waste Materials, Duncan
- Screen Houses, Duncan
- Screen Printing, Duncan
- Seafood Restaurants, Duncan
- Sealants Retail, Duncan
- Secondary Schools, Duncan
- Security & Surveillance System & Equipment, Duncan
- Security Alarm Systems - Home & Business, Duncan
- Security Brokers & Dealers, Duncan
- Security Control Systems & Monitoring, Duncan - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Guard & Patrol Service, Duncan - Bodyguard, Guard Dogs, Etc
- Security Services, Duncan
- Senior Citizens Service & Health Organizations, Duncan
- Septic Tank Installation & Repair, Duncan - Septic Systems
- Septic Tank Pumping & Cleaning, Duncan - Septic Systems
- Septic Tanks & Septic Systems Contractors, Duncan - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Septic Tanks & Systems, Duncan - Wholesale, Dealers & Suppliers
- Sewer & Drain Cleaning & Repair, Duncan - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Duncan - Sewer Line, Pipe Installation & Repair Services
- Sewing & Yarn Stores & Supplies, Duncan
- Sewing Contractors, Duncan
- Sewing Machine Repair & Service, Duncan
- Sewing Machines, Equipment & Supplies, Duncan
- Sheet Metal Contractors, Duncan - Sheet Metal Fabrication
- Sheet Metal Fabricators & Ductwork Contractors, Duncan
- Shirts & T-Shirts, Duncan
- Shoe Store - More, Duncan
- Shoe Stores, Duncan - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Duncan
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- Shutters - Interior & Exterior, Duncan - Wood, Vinyl, Window, Plantation Shutters, etc
- Siding Contractors, Duncan - Vinyl Siding, Wood, Metal & Aluminum Siding Contractors - Installation & Repair
- Signs, Duncan
- Skating Rink & Hockey Operation Services, Duncan
- Small Appliances, Duncan
- Smoked Meat Restaurants, Duncan
- Smoking Cessation Treatment Centers & Information Services, Duncan
- Snacks & Desserts, Duncan
- Social Clubs & Organizations, Duncan
- Social Security And Disability Attorneys & Lawyers, Duncan
- Social Security And Disability Lawyers & Attorneys, Duncan
- Social Security Counselors & Representatives, Duncan
- Social Services & Welfare, Duncan
- Societies & Foundation Associations, Duncan
- Softball Clubs, Duncan
- Spare Rib Restaurants, Duncan
- Special Interest Schools Or Instruction, Duncan
- Speciality Food Stores, Duncan
- Specialty Animal Services, Duncan
- Specialty Stores, Duncan
- Speech & Hearing Specialists, Duncan
- Sporting Goods Stores, Duncan
- Sports Clubs, Duncan
- Sprinkler System Contractors, Duncan - Garden & Lawn Sprinkler System Installation & Repair
- Staffing & Support Services, Duncan
- State Government, Duncan
- Steak House Restaurants, Duncan
- Steam Cleaner - Commercial & Industrial, Duncan - Steam Cleaning - Upholstery, Floor, Carpet, etc
- Steel Manufacturers, Duncan
- Stocks & Bond Brokers, Duncan
- Stress Management & Counseling, Duncan
- Submarine Sandwich Restaurants, Duncan
- Substance Abuse Clinics, Duncan - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Outpatient Clinics, Duncan
- Surveyor Services, Duncan - Surveying Service
- Sweepers & Scrubbers Industrial, Duncan - Sweeping Service
- Swimming, Duncan
- Swimming Pools, Duncan
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