- Safety & Security Systems & Consultants, Douglas
- Sand Gravel & Aggregate, Douglas
- Sandwich Shop Restaurants, Douglas
- Scales Public, Douglas
- Scrap & Waste Materials, Douglas
- Screen Printing, Douglas
- Secondary Schools, Douglas
- Security Brokers & Dealers, Douglas
- Senior Citizens Housing, Douglas
- Senior Citizens Service & Health Organizations, Douglas
- Septic Tank Installation & Repair, Douglas - Septic Systems
- Septic Tank Pumping & Cleaning, Douglas - Septic Systems
- Septic Tanks & Septic Systems Contractors, Douglas - Installation, Repair, Service, Cleaning & Pumping Septic Tanks
- Sewing & Yarn Stores & Supplies, Douglas
- Sewing Machine Repair & Service, Douglas
- Sheriff's Department, Douglas
- Shoe Dyers, Douglas
- Shoe Repair Shops, Douglas
- Shoe Store - More, Douglas
- Shoe Stores, Douglas - Mens, Womens & Kids Shoes
- Shopping & Shopping Services, Douglas
- Signs, Douglas
- Skin Care & Cosmetology Salons, Douglas
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- Skin Care Products & Treatments, Douglas
- Small Appliances, Douglas
- Social Clubs & Organizations, Douglas
- Social Services & Welfare, Douglas
- Societies & Foundation Associations, Douglas
- Solar Energy Companies - Contractors, Douglas - Solar Panel Installation - Solar Power Systems
- Solar Energy Equipment & Systems - Service & Repair, Douglas - Solar Power Systems
- Solar Equipment, Douglas
- Speciality Food Stores, Douglas
- Specialty Goods Storage, Douglas
- Specialty Stores, Douglas
- Sporting Goods Stores, Douglas
- Sports Medicine, Douglas - Doctors, Physicians & Surgeons
- Staffing & Support Services, Douglas
- State Government, Douglas
- Steel & Metal Goods, Douglas - Steel Distributors
- Steel Manufacturers, Douglas
- Stock & Bond Brokers & Dealers, Douglas
- Stocks & Bond Brokers, Douglas
- Substance Abuse Clinics, Douglas - Alcoholism, Addiction & Drug Abuse Treatment Centers
- Substance Abuse Services, Douglas
- Surveyor Services, Douglas - Surveying Service
- Swimming Pools, Douglas
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